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Silver chloride is very insoluble in water and is thus often used as a qualitative test for chlorine. This is very unstable and has only been characterised by its electronic band spectrum when produced in a low-pressure discharge tube.
This reaction is conducted in the oxidising solvent arsenic pentafluoride. The three fluorides of chlorine form a subset of the interhalogen compounds, all of which are diamagnetic.
Chlorine monofluoride ClF is extremely thermally stable, and is sold commercially in gram steel lecture bottles. Its properties are mostly intermediate between those of chlorine and fluorine.
It will react with many metals and nonmetals from room temperature and above, fluorinating them and liberating chlorine.
It will also act as a chlorofluorinating agent, adding chlorine and fluorine across a multiple bond or by oxidation: It will also react exothermically and violently with compounds containing —OH and —NH groups, such as water: It is one of the most reactive known chemical compounds, reacting with many substances which in ordinary circumstances would be considered chemically inert, such as asbestos , concrete, and sand.
It explodes on contact with water and most organic substances. The list of elements it sets on fire is diverse, containing hydrogen , potassium , phosphorus , arsenic , antimony , sulfur , selenium , tellurium , bromine , iodine , and powdered molybdenum , tungsten , rhodium , iridium , and iron.
An impermeable fluoride layer is formed by sodium , magnesium , aluminium , zinc , tin , and silver , which may be removed by heating.
When heated, even such noble metals as palladium , platinum , and gold are attacked and even the noble gases xenon and radon do not escape fluorination.
Its reaction with hydrazine to form hydrogen fluoride, nitrogen, and chlorine gases was used in experimental rocket motors, but has problems largely stemming from its extreme hypergolicity resulting in ignition without any measurable delay.
Today, it is mostly used in nuclear fuel processing, to oxidise uranium to uranium hexafluoride for its enriching and to separate it from plutonium.
It is a very strong fluorinating agent, although it is still not as effective as chlorine trifluoride. Only a few specific stoichiometric reactions have been characterised.
The product, chloryl fluoride , is one of the five known chlorine oxide fluorides. All five behave similarly to the chlorine fluorides, both structurally and chemically, and may act as Lewis acids or bases by gaining or losing fluoride ions respectively or as very strong oxidising and fluorinating agents.
The chlorine oxides are well-studied in spite of their instability all of them are endothermic compounds. They are important because they are produced when chlorofluorocarbons undergo photolysis in the upper atmosphere and cause the destruction of the ozone layer.
None of them can be made from directly reacting the elements. Dichlorine monoxide Cl 2 O is a brownish-yellow gas red-brown when solid or liquid which may be obtained by reacting chlorine gas with yellow mercury II oxide.
It is very soluble in water, in which it is in equilibrium with hypochlorous acid HOCl , of which it is the anhydride.
It is thus an effective bleach and is mostly used to make hypochlorites. It explodes on heating or sparking or in the presence of ammonia gas.
Chlorine dioxide ClO 2 was the first chlorine oxide to be discovered in by Humphry Davy. It is a yellow paramagnetic gas deep-red as a solid or liquid , as expected from its having an odd number of electrons: It is usually prepared by reducing a chlorate as follows: Its production is thus intimately linked to the redox reactions of the chlorine oxoacids.
It is a strong oxidising agent, reacting with sulfur , phosphorus , phosphorus halides, and potassium borohydride. It dissolves exothermically in water to form dark-green solutions that very slowly decompose in the dark.
However, in the presence of light, these solutions rapidly photodecompose to form a mixture of chloric and hydrochloric acids.
The ClO radical leads to the depletion of atmospheric ozone and is thus environmentally important as follows: Chlorine perchlorate ClOClO 3 is a pale yellow liquid that is less stable than ClO 2 and decomposes at room temperature to form chlorine, oxygen, and dichlorine hexoxide Cl 2 O 6.
It hydrolyses in water to give a mixture of chloric and perchloric acids: It is a shock-sensitive, colourless oily liquid.
It is the least reactive of the chlorine oxides, being the only one to not set organic materials on fire at room temperature.
It may be dissolved in water to regenerate perchloric acid or in aqueous alkalis to regenerate perchlorates. However, it thermally decomposes explosively by breaking one of the central Cl—O bonds, producing the radicals ClO 3 and ClO 4 which immediately decompose to the elements through intermediate oxides.
Chlorine forms four oxoacids: As can be seen from the redox potentials given in the adjacent table, chlorine is much more stable towards disproportionation in acidic solutions than in alkaline solutions: 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. Star News in Korean. Retrieved May 14, Retrieved March 11, Archived from the original on February 28, Retrieved September 15, Retrieved September 13, Gaon Music Chart in Korean.
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