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In , while attempting to circumnavigate the globe, Ferdinand Magellan discovered the southern passage now named after him the Strait of Magellan thus becoming the first European to set foot on what is now Chile.
The next Europeans to reach Chile were Diego de Almagro and his band of Spanish conquistadors , who came from Peru in seeking gold.
The Spanish encountered various cultures that supported themselves principally through slash-and-burn agriculture and hunting. Conquest took place gradually, and the Europeans suffered repeated setbacks.
Subsequent major insurrections took place in and in Each time the Mapuche and other native groups revolted, the southern border of the colony was driven northward.
The abolition of slavery by the Spanish crown in was done in recognition that enslaving the Mapuche intensified resistance rather than cowing them into submission.
Despite royal prohibitions, relations remained strained from continual colonialist interference. Cut off to the north by desert, to the south by the Mapuche, to the east by the Andes Mountains, and to the west by the ocean, Chile became one of the most centralized, homogeneous colonies in Spanish America.
Chile hosted one of the largest standing armies in the Americas, making it one of the most militarized of the Spanish possessions, as well as a drain on the treasury of the Viceroyalty of Peru.
The population is estimated at ,, A national junta in the name of Ferdinand — heir to the deposed king — was formed on 18 September The Government Junta of Chile proclaimed Chile an autonomous republic within the Spanish monarchy in memory of this day, Chile celebrates its National Day on 18 September each year.
Intermittent warfare continued until On 12 February , Chile was proclaimed an independent republic. The political revolt brought little social change, however, and 19th-century Chilean society preserved the essence of the stratified colonial social structure, which was greatly influenced by family politics and the Roman Catholic Church.
A strong presidency eventually emerged, but wealthy landowners remained powerful. Chile slowly started to expand its influence and to establish its borders.
Through the founding of Fort Bulnes by the Schooner Ancud under the command of John Williams Wilson , the Magallanes region joined the country in , while the Antofagasta region , at the time part of Bolivia, began to fill with people.
Chile had joined the stand as one of the high-income countries in South America by The Chilean Civil War brought about a redistribution of power between the President and Congress, and Chile established a parliamentary style democracy.
However, the Civil War had also been a contest between those who favored the development of local industries and powerful Chilean banking interests, particularly the House of Edwards who had strong ties to foreign investors.
Soon after, the country engaged in a vastly expensive naval arms race with Argentina that nearly led to war.
The Chilean economy partially degenerated into a system protecting the interests of a ruling oligarchy. By the s, the emerging middle and working classes were powerful enough to elect a reformist president, Arturo Alessandri , whose program was frustrated by a conservative congress.
In the s, Marxist groups with strong popular support arose. A military coup led by General Luis Altamirano in set off a period of political instability that lasted until When constitutional rule was restored in , a strong middle-class party, the Radicals, emerged.
It became the key force in coalition governments for the next 20 years. During the period of Radical Party dominance —52 , the state increased its role in the economy.
The presidential election of Christian Democrat Eduardo Frei Montalva by an absolute majority initiated a period of major reform.
Under the slogan "Revolution in Liberty", the Frei administration embarked on far-reaching social and economic programs, particularly in education, housing, and agrarian reform , including rural unionization of agricultural workers.
By , however, Frei encountered increasing opposition from leftists, who charged that his reforms were inadequate, and from conservatives, who found them excessive.
Allende was not elected with an absolute majority, receiving fewer than 35 percent of votes. The Chilean Congress conducted a runoff vote between the leading candidates, Allende and former president Jorge Alessandri, and, keeping with tradition, chose Allende by a vote of to Production fell and unemployment rose.
Allende adopted measures including price freezes, wage increases, and tax reforms, to increase consumer spending and redistribute income downward.
Many enterprises within the copper , coal, iron, nitrate , and steel industries were expropriated , nationalized, or subjected to state intervention.
The measure was passed unanimously by Congress. The crippled economy was further battered by prolonged and sometimes simultaneous strikes by physicians, teachers, students, truck owners, copper workers, and the small business class.
A military coup overthrew Allende on 11 September As the armed forces bombarded the presidential palace , Allende apparently committed suicide.
A military junta, led by General Augusto Pinochet , took control of the country. The first years of the regime were marked by human rights violations.
Chile actively participated in Operation Condor. The stadium was renamed for Jara in A new Constitution was approved by a controversial plebiscite on 11 September , and General Pinochet became president of the republic for an eight-year term.
After Pinochet obtained rule of the country, several hundred committed Chilean revolutionaries joined the Sandinista army in Nicaragua , guerrilla forces in Argentina or training camps in Cuba , Eastern Europe and Northern Africa.
In the late s, largely as a result of events such as the economic collapse  and mass civil resistance in —88, the government gradually permitted greater freedom of assembly, speech , and association, to include trade union and political activity.
Chile moved toward a free market economy that saw an increase in domestic and foreign private investment, although the copper industry and other important mineral resources were not opened for competition.
Chileans elected a new president and the majority of members of a bicameral congress on 14 December On 27 February , Chile was struck by an 8.
More than people died most from the ensuing tsunami and over a million people lost their homes. The earthquake was also followed by multiple aftershocks.
Chile achieved global recognition for the successful rescue of 33 trapped miners in A rescue effort organized by the Chilean government located the miners 17 days later.
All 33 men were brought to the surface two months later on 13 October over a period of almost 24 hours, an effort that was carried on live television around the world.
The current Constitution of Chile was approved in a national plebiscite —regarded as "highly irregular" by some observers  —in September , under the military government of Augusto Pinochet.
It entered into force in March In September , President Ricardo Lagos signed into law several constitutional amendments passed by Congress. These include eliminating the positions of appointed senators and senators for life , granting the President authority to remove the commanders-in-chief of the armed forces, and reducing the presidential term from six to four years.
Senators serve for eight years with staggered terms, while deputies are elected every 4 years. The last congressional elections were held on 17 November , concurrently with the presidential election.
The current Senate has a 21—15 split in favor of the governing coalition and 2 independents. The current lower house, the Chamber of Deputies, contains 67 members of the governing center-left coalition, 48 from the center-right opposition and 5 from small parties or independents.
Only if the leading coalition ticket out-polls the second place coalition by a margin of more than 2-to-1 does the winning coalition gain both seats, which tends to lock the legislature in a roughly 50—50 split.
In June , Chile completed a nationwide overhaul of its criminal justice system. In the congressional elections, the conservative Independent Democratic Union UDI surpassed the Christian Democrats for the first time to become the largest party in the lower house.
In the legislative elections in Chile, the Communist Party won 3 out of seats in the Chamber of Deputies for the first time in 30 years the Communist Party was not allowed to exist as such during the dictatorship.
Chileans voted in the first round of presidential elections on 17 November None of the nine presidential candidates got more than 50 percent of the vote.
All six have been judged free and fair. The president is constitutionally barred from serving consecutive terms. Since the early decades after independence, Chile has always had an active involvement in foreign affairs.
The war dissolved the confederation while distributing power in the Pacific. German influence came from the organization and training of the army by Prussians.
Since its return to democracy in , Chile has been an active participant in the international political arena. Jose Miguel Insulza, a Chilean national, was elected Secretary General of the Organization of American States in May and confirmed in his position, being re-elected in The country is an active member of the UN family of agencies and participates in UN peacekeeping activities.
An associate member of Mercosur and a full member of APEC, Chile has been a major player in international economic issues and hemispheric free trade.
There have been long arguments between Chileans and Peruvians since the s because they both claim boundary coastal lines. This also known as the "triangulation" which was made to fix the boundary problem between Chile and Peru.
The decisions were accomplished on January 27, by the International Court of Justice  This became the War of the Pacific which was in the years The attempt was also made to The United States but failed badly on October This was later signed by both of them on October 20, to keep peace between them.
In , Peru took Chile to court over their maritime disputes. The Chilean Government has diplomatic relations with most countries.
It settled all its territorial disputes with Argentina during the s except for part of the border at Southern Patagonian Ice Field.
The two countries maintain consular relations and are represented at the Consul General level. In Chile was administratively divided into regions ,  and in subdivided into provinces and these into communes.
Each region is designated by a name and a Roman numeral assigned from north to south, except for the Santiago Metropolitan Region , which does not have a number.
The national flower is the copihue Lapageria rosea , Chilean bellflower , which grows in the woods of southern Chile. The coat of arms depicts the two national animals: The flag of Chile consists of two equal horizontal bands of white top and red; there is a blue square the same height as the white band at the hoist-side end of the white band; the square bears a white five-pointed star in the center representing a guide to progress and honor; blue symbolizes the sky, white is for the snow-covered Andes, and red stands for the blood spilled to achieve independence.
The flag of Chile is similar to the Flag of Texas , although the Chilean flag is 21 years older. The Armed Forces of Chile are subject to civilian control exercised by the president through the Minister of Defense.
The president has the authority to remove the commanders-in-chief of the armed forces. The Chilean Army is one of the most professional and technologically advanced armies in Latin America.
Of the fleet of 29 surface vessels, only eight are operational major combatants frigates. The Navy also operates four submarines based in Talcahuano.
The Air Force took delivery of the final two of ten Fs, all purchased from the U. Chile also took delivery in of a number of reconditioned Block 15 Fs from the Netherlands, bringing to 18 the total of Fs purchased from the Dutch.
After the military coup in September the Chilean national police Carabineros were incorporated into the Defense Ministry. With the return of democratic government, the police were placed under the operational control of the Interior Ministry but remained under the nominal control of the Defense Ministry.
It is situated within the Pacific Ring of Fire. Chile is among the longest north-south countries in the world. If one considers only mainland territory, Chile is unique within this group in its narrowness from east to west, with the other long north-south countries including Brazil , Russia , Canada , and the United States, among others all being wider from east to west by a factor of more than However, this latter claim is suspended under the terms of the Antarctic Treaty , of which Chile is a signatory.
Also controlled but only temporarily inhabited by some local fishermen are the small islands of San Ambrosio and San Felix.
The northern Atacama Desert contains great mineral wealth, primarily copper and nitrates. The relatively small Central Valley, which includes Santiago, dominates the country in terms of population and agricultural resources.
This area is also the historical center from which Chile expanded in the late 19th century, when it integrated the northern and southern regions.
Southern Chile is rich in forests, grazing lands, and features a string of volcanoes and lakes. The southern coast is a labyrinth of fjords, inlets, canals, twisting peninsulas, and islands.
The Andes Mountains are located on the eastern border. There are four seasons in most of the country: The flora and fauna of Chile are characterized by a high degree of endemism, due to its particular geography.
In continental Chile, the Atacama Desert in the north and the Andes mountains to the east are barriers that have led to the isolation of flora and fauna.
The native flora of Chile consists of relatively fewer species compared to the flora of other South American countries.
The northernmost coastal and central region is largely barren of vegetation, approaching the most absolute desert in the world.
Grassland is found in Atlantic Chile in Patagonia. Much of the Chilean flora is distinct from that of neighboring Argentina, indicating that the Andean barrier existed during its formation.
Just over 3, species of fungi are recorded in Chile,   but this number is far from complete. The true total number of fungal species occurring in Chile is likely to be far higher, given the generally accepted estimate that only about 7 percent of all fungi worldwide have so far been discovered.
Among the larger mammals are the puma or cougar, the llama-like guanaco and the fox-like chilla. In the forest region, several types of marsupials and a small deer known as the pudu are found.
There are many species of small birds, but most of the larger common Latin American types are absent. Few freshwater fish are native, but North American trout have been successfully introduced into the Andean lakes.
Whales are abundant, and some six species of seals are found in the area. Chile is located along a highly seismic and volcanic zone, part of the Pacific Ring of Fire, due to the subduction of the Nazca and Antarctic plates in the South American plate.
Late Paleozoic , million years ago, Chile belonged to the continental block called Gondwana. It was just a depression accumulated marine sediments began to rise at the end of the Mesozoic, 66 million years ago, due to the collision between the Nazca and South American plates, resulting in the Andes.
The territory would be shaped by millions of years due to the folding of the rocks, forming the current relief. Among the coastal mountains and the Pacific is a series of coastal plains, of variable length, which allow the settlement of coastal towns and big ports.
Some areas of the plains territories encompass territory east of the Andes, and the Patagonian steppes and Magellan, or are high plateaus surrounded by high mountain ranges, such as the Altiplano or Puna de Atacama.
It is characterized by the presence of the Atacama desert , the most arid in the world. The desert is fragmented by streams that originate in the area known as the pampas Tamarugal.
The Andes, split in two and whose eastern arm runs Bolivia , has a high altitude and volcanic activity, which has allowed the formation of the Andean altiplano and salt structures as the Salar de Atacama , due to the gradual accumulation of sediments over time.
To the south is the Norte Chico , extending to the Aconcagua river. The two mountain ranges intersect, virtually eliminating the intermediate depression.
The existence of rivers flowing through the territory allows the formation of transverse valleys , where agriculture has developed strongly in recent times, while the coastal plains begin to expand.
The Central area is the most populated region of the country. The coastal plains are wide and allow the establishment of cities and ports along the Pacific.
The Andes maintains altitudes above m but descend slowly starts approaching the meters on average. The intermediate depression reappears becoming a fertile valley that allows agricultural development and human settlement, due to sediment accumulation.
To the south, the Cordillera de la Costa reappears in the range of Nahuelbuta while glacial sediments originate a series of lakes in the area of La Frontera.
During the last glaciation , this area was covered by ice that strongly eroded Chilean relief structures.
The Andes mountain range loses height and erosion caused by the action of glaciers has caused fjords. East of the Andes, on the continent, or north of it, on the island of Tierra del Fuego are located relatively flat plains, which in the Strait of Magellan cover large areas.
In the middle of the Pacific, the country has sovereignty over several islands of volcanic origin, collectively known as Insular Chile. Of these, we highlight the archipelago of Juan Fernandez and Easter Island, which is located in the fracture zone between the Nazca plate and the Pacific plate known as East Pacific Rise.
Due to the characteristics of the territory, Chile is crossed by numerous rivers generally short in length and with low torrential flow.
In the center-north of the country, the number of rivers that form valleys of agricultural importance increases.
Their waters mainly flow from Andean snowmelt in the summer and winter rains. The major lakes in this area are the artificial lake Rapel, the Colbun Maule lagoon and the lagoon of La Laja.
Its rate of population growth has been decreasing since , due to a declining birth rate. The largest agglomerations according to the census are Greater Santiago with 5.
A national poll revealed that a majority of Chileans believed they possessed some The census reported , Natives, or 3. Only those that practiced their native culture or spoke their native language were considered to be Natives, irrespective of their "racial purity".
In a census took place, directly asking the public whether they considered themselves as part of any of the eight Chilean ethnic groups, regardless of whether or not they maintained their culture, traditions and language, and 4.
Of that number, Chile is one of 22 countries to have signed and ratified the only binding international law concerning indigenous peoples, the Indigenous and Tribal Peoples Convention, Chile ratified it in A Chilean court decision in November considered to be a landmark ruling on indigenous rights and made use of the convention.
Chile was never a particularly attractive destination for migrants, owing to its remoteness and distance from Europe.
Other groups of Europeans have followed but are found in smaller numbers, like the descendants of Austrians  and Dutch people. Currently, these are estimated at about 50, people.
Sponsored by the Chilean government to "unbarbarize" and colonize the southern region,  these Germans notably the Swiss, Silesians, Alsatians and Austrians settled mainly in Valdivia, Osorno and Llanquihue.
Descendants of different European ethnic groups often intermarried in Chile. This intermarriage and mixture of cultures and races have helped to shape the present society and culture of the Chilean middle and upper classes.
Due in part to its economic fortunes, Chile has recently become a new magnet for immigrants, mostly from neighboring Argentina , Bolivia and mainly Peru.
As of [update] , The Constitution guarantees the right to freedom of religion , and other laws and policies contribute to generally free religious practice.
The law at all levels fully protects this right against abuse by either governmental or private actors. Church and state are officially separate in Chile.
A law on religion prohibits religious discrimination. However, the Roman Catholic church for mostly historical and social reasons enjoys a privileged status and occasionally receives preferential treatment.
The Spanish spoken in Chile is distinctively accented and quite unlike that of neighboring South American countries because final syllables are often dropped, and some consonants have a soft pronunciation.
That the Chilean population was largely formed in a small section at the center of the country and then migrated in modest numbers to the north and south helps explain this relative lack of differentiation, which was maintained by the national reach of radio, and now television, which also helps to diffuse and homogenize colloquial expressions.
There are several indigenous languages spoken in Chile: Mapudungun , Quechua , Aymara and Rapa Nui. After the Spanish invasion, Spanish took over as the lingua franca and the indigenous languages have become minority languages, with some now extinct or close to extinction.
German is still spoken to some extent in southern Chile,  either in small country side pockets or as a second language among the communities of larger cities.
Through initiatives such as the English Opens Doors Program , the government made English mandatory for students in fifth-grade and above in public schools.
Most private schools in Chile start teaching English from kindergarten. In Chile, education begins with preschool until the age of 5.
Primary school is provided for children between ages 6 and Students then attend secondary school until graduation at age Secondary education is divided into two parts: During the first two years, students receive a general education.
Then, they choose a branch: Chilean education is segregated by wealth in a three-tiered system — the quality of the schools reflect socioeconomic backgrounds:.
Upon successful graduation of secondary school, students may continue into higher education. The higher education schools in Chile consist of Chilean Traditional Universities and are divided into public universities or private universities.
There are medical schools and both the Universidad de Chile and Universidad Diego Portales offer law schools in a partnership with Yale University.
The Ministry of Health Minsal is the cabinet-level administrative office in charge of planning, directing, coordinating, executing, controlling and informing the public health policies formulated by the President of Chile.
The National Health Fund Fonasa , created in , is the financial entity entrusted to collect, manage and distribute state funds for health in Chile.
It is funded by the public. All employees pay 7 percent of their monthly income to the fund. Its headquarters are in Santiago and decentralized public service is conducted by various Regional Offices.
More than 12 million beneficiaries benefit from Fonasa. Beneficiaries can also opt for more costly private insurance through Isapre.
Hospitals in Chile are mainly located in the Santiago Metropolitan Region. The Central Bank of Chile in Santiago serves as the central bank for the country.
Chile has the highest degree of economic freedom in South America ranking 7th worldwide , owing to its independent and efficient judicial system and prudent public finance management.
Sound economic policies, maintained consistently since the s, have contributed to steady economic growth in Chile and have more than halved poverty rates.
The economy remained sluggish until , when it began to show clear signs of recovery, achieving 4. Real GDP growth reached 5.
GDP expanded by 5 percent in Nonetheless, economic analysts disagreed with government estimates and predicted economic growth at a median of 1.
Growth slowed to 4. The unemployment rate was 6. The privatized national pension system AFP has encouraged domestic investment and contributed to an estimated total domestic savings rate of approximately 21 percent of GDP.
Chile has signed free trade agreements FTAs with a whole network of countries, including an FTA with the United States that was signed in and implemented in January Registration is reported to be simple and transparent, and foreign investors are guaranteed access to the official foreign exchange market to repatriate their profits and capital.
Agriculture in Chile encompasses a wide range of different activities due to its particular geography , climate and geology and human factors.
Now agriculture and allied sectors like forestry , logging and fishing account for only 4. Some major agriculture products of Chile include grapes , apples , pears , onions , wheat , corn , oats , peaches , garlic , asparagus , beans , beef , poultry , wool , fish , timber and hemp.
Chile currently utilizes 14, Hectares of agricultural land. Tourism in Chile has experienced sustained growth over the last few decades. In , tourism grew by According to the National Service of Tourism Sernatur , 2 million people a year visit the country.
Most of these visitors come from other countries in the American continent, mainly Argentina ; followed by a growing number from the United States, Europe, and Brazil with a growing number of Asians from South Korea and PR China.
The main attractions for tourists are places of natural beauty situated in the extreme zones of the country: San Pedro de Atacama , in the north, is very popular with foreign tourists who arrive to admire the Incaic architecture, the altiplano lakes, and the Valley of the Moon.
For locals, tourism is concentrated mostly in the summer December to March , and mainly in the coastal beach towns.
In November the government launched a campaign under the brand "Chile: All Ways Surprising" intended to promote the country internationally for both business and tourism.
Chile is home to the world renowned Patagonian Trail that resides on the border between Argentina and Chile.
Chile recently launched a massive scenic route for tourism in hopes of encouraging development based on conservation. Buses are now the main means of long distance transportation in Chile, following the decline of its railway network.
Chile has a total of runways 62 paved and unpaved. Chile has a telecommunication system which covers much of the country, including Chilean insular and Antarctic bases.
Privatization of the telephone system began in ; Chile has one of the most advanced telecommunications infrastructure in South America with a modern system based on extensive microwave radio relay facilities and domestic satellite system with 3 earth stations.
From the period between early agricultural settlements and up to the late pre-Hispanic period, northern Chile was a region of Andean culture that was influenced by altiplano traditions spreading to the coastal valleys of the north, while southern regions were areas of Mapuche cultural activities.
The rates of reaction for the chlorine oxyanions increases as the oxidation state of chlorine decreases. The strengths of the chlorine oxyacids increase very quickly as the oxidation state of chlorine increases due to the increasing delocalisation of charge over more and more oxygen atoms in their conjugate bases.
Most of the chlorine oxoacids may be produced by exploiting these disproportionation reactions. Hypochlorous acid HOCl is highly reactive and quite unstable; its salts are mostly used for their bleaching and sterilising abilities.
They are very strong oxidising agents, transferring an oxygen atom to most inorganic species. Chlorous acid HOClO is even more unstable and cannot be isolated or concentrated without decomposition: However, sodium chlorite is a stable salt and is useful for bleaching and stripping textiles, as an oxidising agent, and as a source of chlorine dioxide.
Its most important salt is sodium chlorate , mostly used to make chlorine dioxide to bleach paper pulp. The decomposition of chlorate to chloride and oxygen is a common way to produce oxygen in the laboratory on a small scale.
Chloride and chlorate may comproportionate to form chlorine as follows: Perchloric acid and aqueous perchlorates are vigorous and sometimes violent oxidising agents when heated, in stark contrast to their mostly inactive nature at room temperature due to the high activation energies for these reactions for kinetic reasons.
Perchlorates are made by electrolytically oxidising sodium chlorate, and perchloric acid is made by reacting anhydrous sodium perchlorate or barium perchlorate with concentrated hydrochloric acid, filtering away the chloride precipitated and distilling the filtrate to concentrate it.
Anhydrous perchloric acid is a colourless mobile liquid that is sensitive to shock that explodes on contact with most organic compounds, sets hydrogen iodide and thionyl chloride on fire and even oxidises silver and gold.
Like the other carbon—halogen bonds, the C—Cl bond is a common functional group that forms part of core organic chemistry. Formally, compounds with this functional group may be considered organic derivatives of the chloride anion.
Due to the difference of electronegativity between chlorine 3. Chlorination modifies the physical properties of hydrocarbons in several ways: Alkanes and aryl alkanes may be chlorinated under free radical conditions, with UV light.
However, the extent of chlorination is difficult to control: Aryl chlorides may be prepared by the Friedel-Crafts halogenation , using chlorine and a Lewis acid catalyst.
Chlorine adds to the multiple bonds on alkenes and alkynes as well, giving di- or tetra-chloro compounds. However, due to the expense and reactivity of chlorine, organochlorine compounds are more commonly produced by using hydrogen chloride, or with chlorinating agents such as phosphorus pentachloride PCl 5 or thionyl chloride SOCl 2.
The last is very convenient in the laboratory because all side products are gaseous and do not have to be distilled out.
Many organochlorine compounds have been isolated from natural sources ranging from bacteria to humans.
Some types of organochlorides, though not all, have significant toxicity to plants or animals, including humans. Dioxins, produced when organic matter is burned in the presence of chlorine, and some insecticides, such as DDT , are persistent organic pollutants which pose dangers when they are released into the environment.
For example, DDT, which was widely used to control insects in the mid 20th century, also accumulates in food chains, and causes reproductive problems e.
Chlorine is too reactive to occur as the free element in nature but is very abundant in the form of its chloride salts.
All of these pale in comparison to the reserves of chloride ions in seawater: Small batches of chlorine gas are prepared in the laboratory by combining hydrochloric acid and manganese dioxide , but the need rarely arises due to its ready availability.
In industry, elemental chlorine is usually produced by the electrolysis of sodium chloride dissolved in water.
This method, the chloralkali process industrialized in , now provides most industrial chlorine gas. The process proceeds according to the following chemical equation: In diaphragm cell electrolysis, an asbestos or polymer-fiber diaphragm separates a cathode and an anode , preventing the chlorine forming at the anode from re-mixing with the sodium hydroxide and the hydrogen formed at the cathode.
Diaphragm methods produce dilute and slightly impure alkali, but they are not burdened with the problem of mercury disposal and they are more energy efficient.
Membrane cell electrolysis employs permeable membrane as an ion exchanger. Saturated sodium or potassium chloride solution is passed through the anode compartment, leaving at a lower concentration.
This method also produces very pure sodium or potassium hydroxide but has the disadvantage of requiring very pure brine at high concentrations.
In the Deacon process , hydrogen chloride recovered from the production of organochlorine compounds is recovered as chlorine.
The process relies on oxidation using oxygen:. The reaction requires a catalyst. As introduced by Deacon, early catalysts were based on copper.
Commercial processes, such as the Mitsui MT-Chlorine Process, have switched to chromium and ruthenium-based catalysts.
Sodium chloride is by a huge margin the most common chlorine compound, and it is the main source of chlorine and hydrochloric acid for the enormous chlorine-chemicals industry today.
About chlorine-containing compounds are commercially traded, including such diverse compounds as chlorinated methanes and ethanes , vinyl chloride and its polymer polyvinyl chloride PVC , aluminium trichloride for catalysis , the chlorides of magnesium , titanium , zirconium , and hafnium which are the precursors for producing the pure elements, and so on.
Other particularly important organochlorines are methyl chloride , methylene chloride , chloroform , vinylidene chloride , trichloroethylene , perchloroethylene , allyl chloride , epichlorohydrin , chlorobenzene , dichlorobenzenes , and trichlorobenzenes.
This was done in "gut factories" boyauderies , and it was an odiferous and unhealthy process. The same chemicals were found to be useful in the routine disinfection and deodorization of latrines , sewers , markets, abattoirs , anatomical theatres , and morgues.
In , the contagion of infections was well known, even though the agency of the microbe was not discovered until more than half a century later.
During the Paris cholera outbreak of , large quantities of so-called chloride of lime were used to disinfect the capital. This was not simply modern calcium chloride , but chlorine gas dissolved in lime-water dilute calcium hydroxide to form calcium hypochlorite chlorinated lime.
Chloride of lime was used for destroying odors and "putrid matter". One source claims chloride of lime was used by Dr. John Snow to disinfect water from the cholera-contaminated well that was feeding the Broad Street pump in London,  though three other reputable sources that describe that famous cholera epidemic do not mention the incident.
A modified version of this solution continues to be employed in wound irrigation in modern times, where it remains effective against bacteria that are resistant to multiple antibiotics see Century Pharmaceuticals.
The first continuous application of chlorination to drinking U. Chlorine is presently an important chemical for water purification such as in water treatment plants , in disinfectants , and in bleach.
Even small water supplies are now routinely chlorinated. Chlorine is usually used in the form of hypochlorous acid to kill bacteria and other microbes in drinking water supplies and public swimming pools.
In most private swimming pools, chlorine itself is not used, but rather sodium hypochlorite , formed from chlorine and sodium hydroxide , or solid tablets of chlorinated isocyanurates.
The drawback of using chlorine in swimming pools is that the chlorine reacts with the proteins in human hair and skin.
As a disinfectant in water, chlorine is more than three times as effective against Escherichia coli as bromine , and more than six times as effective as iodine.
It is often impractical to store and use poisonous chlorine gas for water treatment, so alternative methods of adding chlorine are used.
These include hypochlorite solutions, which gradually release chlorine into the water, and compounds like sodium dichloro-s-triazinetrione dihydrate or anhydrous , sometimes referred to as "dichlor", and trichloro-s-triazinetrione , sometimes referred to as "trichlor".
These compounds are stable while solid and may be used in powdered, granular, or tablet form. When added in small amounts to pool water or industrial water systems, the chlorine atoms hydrolyze from the rest of the molecule forming hypochlorous acid HOCl , which acts as a general biocide, killing germs, micro-organisms, algae, and so on.
It also tasted metallic and stung the back of the throat and chest. Chlorine reacts with water in the mucosa of the lungs to form hydrochloric acid , destructive to living tissue and potentially lethal.
Human respiratory systems can be protected from chlorine gas by gas masks with activated charcoal or other filters, which makes chlorine gas much less lethal than other chemical weapons.
It was pioneered by a German scientist later to be a Nobel laureate, Fritz Haber of the Kaiser Wilhelm Institute in Berlin, in collaboration with the German chemical conglomerate IG Farben , which developed methods for discharging chlorine gas against an entrenched enemy.
Chlorine gas was also used during the Iraq War in Anbar Province in , with insurgents packing truck bombs with mortar shells and chlorine tanks.
The attacks killed two people from the explosives and sickened more than Most of the deaths were caused by the force of the explosions rather than the effects of chlorine since the toxic gas is readily dispersed and diluted in the atmosphere by the blast.
In some bombings, over a hundred civilians were hospitalized due to breathing difficulties. The Iraqi authorities tightened security for elemental chlorine, which is essential for providing safe drinking water to the population.
The Syrian government allegedly uses chlorine as a chemical weapon ,  often dropping it in barrel bombs ,  but sometimes also in rockets.
The chloride anion is an essential nutrient for metabolism. Chlorine is needed for the production of hydrochloric acid in the stomach and in cellular pump functions.
Overly low or high concentrations of chloride in the blood are examples of electrolyte disturbances. Hypochloremia having too little chloride rarely occurs in the absence of other abnormalities.
It is sometimes associated with hypoventilation. When symptoms do occur, they tend to resemble those of hypernatremia having too much sodium.
Reduction in blood chloride leads to cerebral dehydration; symptoms are most often caused by rapid rehydration which results in cerebral edema.
Hyperchloremia can affect oxygen transport. Chlorine is a toxic gas that attacks the respiratory system, eyes, and skin.
Chlorine gas is a strong oxidizer, which may react with flammable materials. Chlorine is detectable with measuring devices in concentrations as low as 0.
When used at specified levels for water disinfection, the reaction of chlorine with water is not a major concern for human health. Other materials present in the water may generate disinfection by-products that are associated with negative effects on human health.
The National Institute for Occupational Safety and Health has designated a recommended exposure limit of 0. In the home, accidents occur when hypochlorite bleach solutions come into contact with certain acidic drain-cleaners to produce chlorine gas.
Chlorine is widely used for purifying water, especially potable water supplies and water used in swimming pools. Several catastrophic collapses of swimming pool ceilings have occurred from chlorine-induced stress corrosion cracking of stainless steel suspension rods.
Both materials were used in hot and cold water domestic plumbing, and stress corrosion cracking caused widespread failures in the US in the s and s.
The adjacent picture shows a fractured acetal joint in a water supply system. The cracks started at injection molding defects in the joint and slowly grew until the part failed.
The fracture surface shows iron and calcium salts that were deposited in the leaking joint from the water supply before failure.
The element iron can combine with chlorine at high temperatures in a strong exothermic reaction, creating a chlorine-iron fire. From Wikipedia, the free encyclopedia.
This article is about the chemical element. For other uses, see Chlorine disambiguation. For other uses, see CL disambiguation and CL2 disambiguation.
Chemical element with atomic number Chlorine production and Chloralkali process. Water chlorination and Bleach. Chemical weapons in World War I.
Chlorine bombings in Iraq. Use of chemical weapons in the Syrian Civil War. Chemical Rubber Company Publishing. Archived from the original on April 30, In section 6 on pp.
After this mixture had been standing in the cold for one hour, the acid had assumed a dark brown colour. One part of this solution was poured into a glass, which was placed over the fire.
For an English translation of the relevant passages of this article, see: The Early History of Chlorine: Papers by Carl Wilhelm Scheele , C.
Berthollet , Guyton de Morveau , J. Thenard Edinburgh, Scotland: Alembic Club, , pp. Archived from the original on The development of modern chemistry.
Journal of Chemical Education. The phenomena that it presents can be explained well enough on this hypothesis; we shall not seek to defend it, however, as it appears to us that they are still better explained by regarding oxygenated muriatic acid as a compound body.
On some of the combinations of oxymuriatic gas and oxygene, and on the chemical relations of these principles, to inflammable bodies".
Philosophical Transactions of the Royal Society of London. Davy named chlorine on p. Archived from the original on June 15, Archived from the original on 13 December Retrieved 13 December History of Industrial Gases.
Labarraque — " [The great pharmacists: Archived from the original PDF on 21 February Archived from the original on 14 August The Riddle of the Rhine: Chemical Strategy in Peace and War.
Archived from the original PDF on Earth and Planetary Science Letters. Journal of Environmental Radioactivity. Environmental Science and Technology.
Progress in the Chemistry of Organic Natural Products. Science and technology in medicine. Translated by James Scott. Highley, Accessed Nov 1, The Foul and the Fragrant: Cholera, Chloroform, and the Science of Medicine.
John Snow and the Mystery of Cholera. More Than His Solution". A Half Century of Progress. The Elements, in Handbook of Chemistry and Physics 81st ed.
Archived from the original on March 30, Archived from the original on October 24, Kurdistan Region Security Council.
The New York Times. Archived from the original on 31 March Retrieved 30 April
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