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[the ‘chloride ion’ 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
.
Electronic properties
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, for some chloride salts, such as silver chloride, lead (II) chloride, and mercury(I) chloride, they are slightly soluble in water.[5] In aqueous solution, chloride is bound by the protic end of the water molecules.
Reactions of chloride[edit]
Chloride can be oxidized but not reduced. The first oxidation, as employed in the chlor-alkali process, is conversion to chlorine gas. Chlorine can be further oxidized to other oxides and oxyanions including hypochlorite (ClO−, the active ingredient in chlorine bleach), chlorine dioxide (ClO2), chlorate (ClO−
3), and perchlorate (ClO−
4).
In terms of its acid–base properties, chloride is a very weak base as indicated by the negative value of the pKa of hydrochloric acid. Chloride can be protonated by strong acids, such as sulfuric acid:
NaCl + H2SO4 → NaHSO4 + HCl
Ionic chloride salts reaction with other salts to exchange anions. The presence of chloride is often detected by its formation of an insoluble silver chloride upon treatment with silver ion:
Cl− + Ag+ → AgCl
The concentration of chloride in an assay can be determined using a chloridometer, which detects silver ions once all chloride in the assay has precipitated via this reaction.
Chlorided silver electrodes are commonly used in ex vivo electrophysiology.[6]
Other oxyanions[edit]
Chlorine can assume oxidation states of −1, +1, +3, +5, or +7. Several neutral chlorine oxides are also known.
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
Occurrence in nature[edit]
In nature, chloride is found primarily in seawater, which contains 1.94% chloride. Smaller quantities, though at higher concentrations, occur in certain inland seas and in subterranean brine wells, such as the Great Salt Lake, Utah and the Dead Sea, Israel.[7] Most chloride salts are soluble in water, thus, chloride-containing minerals are usually only found in abundance in dry climates or deep underground. Some chloride-containing minerals include halite (sodium chloride NaCl), sylvite (potassium chloride KCl), bischofite (MgCl2∙6H2O), carnallite (KCl∙MgCl2∙6H2O), and kainite (KCl∙MgSO4 ∙3H2O). It is also found in evaporite minerals such as chlorapatite and sodalite.
Role in biology[edit]
Chloride has a major physiological significance, which includes regulation of osmotic pressure, electrolyte balance and acid-base homeostasis. Chloride is the most abundant extracellular anion and accounts for around one third of extracellular fluid tonicity.[8][9]
Chloride is an essential electrolyte, playing a key role in maintaining cell homeostasis and transmitting action potentials in neurons.[10] It can flow through chloride channels (including the GABAA receptor) and is transported by KCC2 and NKCC2 transporters.
Chloride is usually (though not always) at a higher extracellular concentration, causing it to have a negative reversal potential (around -61 mV at 37 degrees Celsius in a mammalian cell).[11] Characteristic concentrations of chloride in model organisms are: in both E. coli and budding yeast are 10-200mM (media dependent), in mammalian cell 5-100mM and in blood plasma 100mM.[12]
The concentration of chloride in the blood is called serum chloride, and this concentration is regulated by the kidneys. A chloride ion is a structural component of some proteins, e.g., it is present in the amylase enzyme. For these roles, chloride is one of the essential dietary mineral (listed by its element name chlorine). Serum chloride levels are mainly regulated by the kidneys through a variety of transporters that are present along the nephron.[13] Most of the chloride, which is filtered by the glomerulus, is reabsorbed by both proximal and distal tubules (majorly by proximal tubule) by both active and passive transport.[14]
Corrosion[edit]
The structure of sodium chloride, revealing the tendency of chloride ions (green spheres) to link to several cations.
The presence of chlorides, e.g. in seawater, significantly worsens the conditions for pitting corrosion of most metals (including stainless steels, aluminum and high-alloyed materials). Chloride-induced corrosion of steel in concrete lead to a local breakdown of the protective oxide form in alkaline concrete, so that a subsequent localized corrosion attack takes place.[15]
Environmental threats[edit]
Increased concentrations of chloride can cause a number of ecological effects in both aquatic and terrestrial environments. It may contribute to the acidification of streams, mobilize radioactive soil metals by ion exchange, affect the mortality and reproduction of aquatic plants and animals, promote the invasion of saltwater organisms into previously freshwater environments, and interfere with the natural mixing of lakes. Salt (sodium chloride) has also been shown to change the composition of microbial species at relatively low concentrations. It can also hinder the denitrification process, a microbial process essential to nitrate removal and the conservation of water quality, and inhibit the nitrification and respiration of organic matter.[16]
Production[edit]
The chlor-alkali industry is a major consumer of the world’s energy budget. This process converts sodium chloride into chlorine and sodium hydroxide, which are used to make many other materials and chemicals. The process involves two parallel reactions:
2 Cl− → Cl
2 + 2 e−
2 H
2O + 2 e− → H2 + 2 OH−
Basic membrane cell used in the electrolysis of brine. At the anode (A), chloride (Cl−) is oxidized to chlorine. The ion-selective membrane (B) allows the counterion Na+ to freely flow across, but prevents anions such as hydroxide (OH−) and chloride from diffusing across. At the cathode (C), water is reduced to hydroxide and hydrogen gas.
Examples and uses[edit]
An example is table salt, which is sodium chloride with the chemical formula NaCl. In water, it dissociates into Na+ and Cl− ions. Salts such as calcium chloride, magnesium chloride, potassium chloride have varied uses ranging from medical treatments to cement formation.[4]
Calcium chloride (CaCl2) is a salt that is marketed in pellet form for removing dampness from rooms. Calcium chloride is also used for maintaining unpaved roads and for fortifying roadbases for new construction. In addition, calcium chloride is widely used as a de-icer, since it is effective in lowering the melting point when applied to ice.[17]
Examples of covalently bonded chlorides are phosphorus trichloride, phosphorus pentachloride, and thionyl chloride, all three of which are reactive chlorinating reagents that have been used in a laboratory.
Water quality and processing[edit]
A major application involving chloride is desalination, which involves the energy intensive removal of chloride salts to give potable water. In the petroleum industry, the chlorides are a closely monitored constituent of the mud system. An increase of the chlorides in the mud system may be an indication of drilling into a high-pressure saltwater formation. Its increase can also indicate the poor quality of a target sand.[citation needed]
Chloride is also a useful and reliable chemical indicator of river / groundwater fecal contamination, as chloride is a non-reactive solute and ubiquitous to sewage & potable water. Many water regulating companies around the world utilize chloride to check the contamination levels of the rivers and potable water sources.[18]
Food[edit]
Chloride salts such as sodium chloride are used to preserve food and as nutrients or condiments.
See also[edit]
Halide (compounds of halogens)
Renal chloride reabsorption
References[edit]
^ “Chloride ion – PubChem Public Chemical Database”. The PubChem Project. USA: National Center for Biotechnology Information.
^ Jump up to: a b Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A21. ISBN 0-618-94690-X.
^ Wells, John C. (2008), Longman Pronunciation Dictionary (3rd ed.), Longman, p. 143, ISBN 9781405881180.
^ Jump up to: a b Green, John, and Sadru Damji. “Chapter 3.” Chemistry. Camberwell, Vic.: IBID, 2001. Print.
^ Zumdahl, Steven (2013). Chemical Principles (7th ed.). Cengage Learning. p. 109. ISBN 978-1-285-13370-6.
^ Molleman, Areles (2003). “Patch Clamping: An Introductory Guide to Patch Clamp Electrophysiology”. Wiley & Sons. ISBN 978-0-471-48685-5.
^ Greenwood, N. N. (1984). Chemistry of the elements (1st ed.). Oxford [Oxfordshire]: Pergamon Press. ISBN 9780750628327.
^ Berend, Kenrick; van Hulsteijn, Leonard Hendrik; Gans, Rijk O.B. (April 2012). “Chloride: The queen of electrolytes?”. European Journal of Internal Medicine. 23 (3): 203–211. doi:10.1016/j.ejim.2011.11.013. PMID 22385875.
^ Rein, Joshua L.; Coca, Steven G. (1 March 2019). “”I don’t get no respect”: the role of chloride in acute kidney injury”. American Journal of Physiology. Renal Physiology. 316 (3): F587–F605. doi:10.1152/ajprenal.00130.2018. ISSN 1931-857X. PMC 6459301.
^ Jentsch, Thomas J.; Stein, Valentin; Weinreich, Frank; Zdebik, Anselm A. (2002-04-01). “Molecular Structure and Physiological Function of Chloride Channels”. Physiological Reviews. 82 (2): 503–568. doi:10.1152/physrev.00029.2001. ISSN 0031-9333. PMID 11917096.
^ “Equilibrium potentials”. www.d.umn.edu.
^ Milo, Ron; Philips, Rob. “Cell Biology by the Numbers: What are the concentrations of different ions in cells?”. book.bionumbers.org. Retrieved 24 March 2017.
^ Nagami, Glenn T. (1 July 2016). “Hyperchloremia – Why and how”. Nefrología (English Edition). 36 (4): 347–353. doi:10.1016/j.nefro.2016.04.001. ISSN 2013-2514.
^ Shrimanker, Isha; Bhattarai, Sandeep (2020). “Electrolytes”. StatPearls. StatPearls Publishing.
^ Criado, M. “13 – The corrosion behaviour of reinforced steel embedded in alkali-activated mortar”. Handbook of Alkali-Activated Cements, Mortars and Concretes. Woodhead Publishing. pp. 333–372. ISBN 978-1-78242-276-1.
^ Kaushal, S. S. “Chloride”. Encyclopedia of Inland Waters. Academic Press. pp. 23–29. ISBN 978-0-12-370626-3.
^ “Common Salts”. hyperphysics.phy-astr.gsu.edu. Georgia State University.
^ “Chlorides”. www.gopetsamerica.com. Archived from the original on 18 August 2016. Retrieved 14 April 2018.
Identifiers
CAS Number
16887-00-6 check
3D model (JSmol)
Interactive image
Beilstein Reference
3587171
ChEBI
CHEBI:17996
ChEMBL
ChEMBL19429 check
ChemSpider
306 check
Gmelin Reference
14910
IUPHAR/BPS
2339
KEGG
C00698 check
PubChem CID
312
UNII
Q32ZN48698 check
CompTox Dashboard (EPA)
DTXSID6043969 Edit this at Wikidata
InChI[show]
SMILES[show]
Properties
Chemical formula
Cl−
Molar mass 35.45 g·mol−1
Conjugate acid Hydrogen chloride
Thermochemistry
Std molar
entropy (So298)
153.36 J K−1 mol−1[2]
Std enthalpy of
formation (ΔfH⦵298)
−167 kJ·mol−1[2]
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
en.wikipedia.org /wiki/Chloride
Chloride
Contributors to Wikimedia projects
12-15 minutes
Chloride
Cl-.svg
Chloride ion.svg
Names
Systematic IUPAC name
Chloride
the chloride ion/ˈklɔraɪd/[3] is the anion (negatively charged ion) Cl−.
It is formed when the elementchlorine (ahalogen) 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.[4] 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.[5] The word chloride can also form part of the name of chemical compounds in which one or more chlorineatoms are covalently bonded.
For example, methyl chloride, more commonly called chloromethane, (CH3Cl) is an organic compound with a covalent C-Cl bond.
It is not a source of chloride ion
.
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