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Chloride

Chloride
Cl-.svg
Chloride ion.svg
Names
Systematic IUPAC name
Chloride
Identifiers
16887-00-6 YesY
3D model (Jmol) Interactive image
3587171
ChEBI CHEBI:17996
ChEMBL ChEMBL19429 YesY
ChemSpider 306 YesY
14910
2339
KEGG C00698 YesY
PubChem 312
Properties
Cl
Molar mass 35.45 g·mol−1
Thermochemistry
153.36 J K−1 mol−1
−167 kJ·mol−1
Related compounds
Other anions
Fluoride

Bromide
Iodide

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Bromide
Iodide

The chloride ion /ˈklɔərd/ is the anion (negatively charged ion) Cl. It is formed when the element chlorine (a halogen) gains an electron or when a compound such as hydrogen chloride is dissolved in water or other polar solvents. Chloride salts such as sodium chloride are often very soluble in water. It is an essential electrolyte located in all body fluids responsible for maintaining acid/base balance, transmitting nerve impulses and regulating fluid in and out of cells. Less frequently, the word chloride may also form part of the "common" name of chemical compounds in which one or more chlorine atoms are covalently bonded. For example, methyl chloride, with the standard name chloromethane (see IUPAC books) is an organic compound with a covalent C−Cl bond in which the chlorine is not an anion.

A chloride ion is much larger than a chlorine atom, 167 and 99 pm, respectively. The ion is colorless and diamagnetic. In aqueous solution, it is highly soluble in most cases; however, some chloride salts, such as silver chloride, lead(II) chloride, and mercury(I) chloride are slightly soluble in water. In aqueous solution, chloride is bound by the protic end of the water molecules.

Sea water contains 1.94% chloride. Some chloride-containing minerals include the chlorides of sodium (halite or NaCl), potassium (sylvite or KCl), and magnesium (bischofite), hydrated MgCl2. Called serum chloride, the concentration of chloride in the blood is regulated by the kidneys. A chloride ion is a structural component of some proteins, e.g., it is present in the amylase enzyme.


Chlorine oxidation state −1 +1 +3 +5 +7
Name chloride hypochlorite chlorite chlorate perchlorate
Formula Cl ClO ClO
2
ClO
3
ClO
4
Structure The chloride ion The hypochlorite ion The chlorite ion The chlorate ion The perchlorate ion

2 ClCl
2
+ 2 e
H
2
O
+ 2 e → H2 + 2 OH
Crystals of sodium chloride, which, like most chloride salts is colorless and water-soluble.
The structure of sodium chloride, revealing the tendency of chloride ions (green spheres) to link to several cations.
NaCl + H2SO4 → NaHSO4 + HCl
Cl + Ag+ → AgCl
...
Wikipedia

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