World Library  
Flag as Inappropriate
Email this Article

Chlorite

Article Id: WHEBN0000158901
Reproduction Date:

Title: Chlorite  
Author: World Heritage Encyclopedia
Language: English
Subject: Chlorine, Oxyanion, Polyatomic ion, Perchlorate, Hypochlorite
Collection: Chlorine Oxides, Chlorites, Oxoanions
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Chlorite

Chlorite
The chlorite ion
The chlorite ion
Names
IUPAC name
Chlorite
Identifiers
Jmol-3D images Image
Properties
ClO2
Molar mass 67.452
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

The chlorite ion, or chlorine dioxide anion, is ClO2. A chlorite (compound) is a compound that contains this group, with chlorine in oxidation state +3. Chlorites are also known as salts of chlorous acid.

Contents

  • Compounds 1
  • Structure and Properties 2
  • Uses 3
  • Other oxyanions 4
  • See also 5
  • References 6

Compounds

The free acid, chlorous acid HClO2, is the least stable oxoacid of chlorine and has only been observed as an aqueous solution at low concentrations. Since it cannot be concentrated, it is not a commercial product. The alkali metal and alkaline earth metal compounds are all colorless or pale yellow, with sodium chlorite (NaClO2) being the ony commercially important chlorite. Heavy metals chlorites (Ag+, Hg+, Tl+, Pb2+, and also Cu2+ and NH4+) are unstable and decompose explosively with heat or shock.[1]

Sodium chlorite is derived indirectly from sodium chlorate, NaClO3. First, the explosively unstable gas chlorine dioxide, ClO2 is produced by reducing sodium chlorate in a strong acid solution with a suitable reducing agent (for example, sodium chloride, sulfur dioxide, or hydrochloric acid).

Structure and Properties

The chlorite ion adopts a bent molecular geometry, due to the effects of the lone pairs on the chlorine atom, with a O-Cl-O bond angle of 111° and Cl-O bond lengths of 156pm.[1] When compared to other chlorine oxyanions (on the basis of standard half cell potentials) chlorite is one strongest oxidizing agents in the series.[2]

Ion Acidic reaction E° (V) Neutral/basic reaction E° (V)
Hypochlorite H+ + HOCl + e → ½Cl2(g) + H2O 1.63 ClO + H2O + 2e → Cl + 2OH 0.89
Chlorite 3H+ + HOClO + 3e → ½Cl2(g) + 2H2O 1.64 ClO2 + 2H2O + 4e → Cl + 4OH 0.78
Chlorate 6H+ + ClO3 + 5e → ½Cl2(g) + 3H2O 1.47 ClO3 + 3H2O + 6e → Cl + 6OH 0.63
Perchlorate 8H+ + ClO4 + 7e → ½Cl2(g) + 4H2O 1.42 ClO4 + 4H2O + 8e → Cl + 8OH 0.56

Uses

The most important chlorite is sodium chlorite; this is used in the bleaching of textiles, pulp, and paper, however despite its strongly oxidizing nature it is often not used directly being instead used to generate the neutral species chlorine dioxide (ClO2), normally via a reaction with HCl:

5 NaClO2 + 4 HCl → 5 NaCl + 4 ClO2 + 2 H2O

Other oxyanions

Several oxyanions of chlorine exist, in which it can assume oxidation states of −1, +1, +3, +5, or +7 within the corresponding anions Cl, ClO, ClO2, ClO3, or ClO4, known commonly and respectively as chloride, hypochlorite, chlorite, chlorate, and perchlorate. These are part of a greater family of other chlorine oxides.

oxidation state −1 +1 +3 +5 +7
anion named chloride hypochlorite chlorite chlorate perchlorate
formula Cl ClO ClO2 ClO3 ClO4
structure The chloride ion The hypochlorite ion The chlorite ion The chlorate ion The perchlorate ion

See also

References

  1. ^ a b Greenwood, N.N.; Earnshaw, A. (2006). Chemistry of the elements (2nd ed.). Oxford: Butterworth-Heinemann. p. 861.  
  2. ^  
  • Kirk-Othmer Concise Encyclopedia of Chemistry, Martin Grayson, Editor, John Wiley & Sons, Inc., 1985
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.