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Chlorite


Source: http://en.wikipedia.org/wiki/Chlorite
Updated: 2017-06-29T17:10Z
Chlorite
The chlorite ion
The chlorite ion
Names
IUPAC name
Chlorite
Identifiers
3D model (JSmol)
ChemSpider
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EC Number215-285-9
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Properties
ClO
2
Molar mass67.452
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

The chlorite ion, or chlorine dioxide anion, is ClO
2
. 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.

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 only commercially important chlorite. Heavy metals chlorites (Ag+, Hg+, Tl+, Pb2+, and also Cu2+ and NH+
4
) 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 an O–Cl–O bond angle of 111° and Cl–O bond lengths of 156 pm.[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]

IonAcidic reactionE° (V)Neutral/basic reactionE° (V)
HypochloriteH+ + HOCl + e12 Cl2(g) + H2O1.63ClO + H2O + 2 e → Cl + 2 OH0.89
Chlorite3 H+ + HOClO + 3 e12 Cl2(g) + 2 H2O1.64ClO
2
+ 2 H2O + 4 e → Cl + 4 OH
0.78
Chlorate6 H+ + ClO
3
+ 5 e12 Cl2(g) + 3 H2O
1.47ClO
3
+ 3 H2O + 6 e → Cl + 6 OH
0.63
Perchlorate8 H+ + ClO
4
+ 7 e12 Cl2(g) + 4 H2O
1.42ClO
4
+ 4 H2O + 8 e → Cl + 8 OH
0.56

Uses

The most important chlorite is sodium chlorite (NaClO2); 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, ClO
2
, ClO
3
, or ClO
4
, 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 namedchloridehypochloritechloritechlorateperchlorate
formulaClClOClO
2
ClO
3
ClO
4
structureThe chloride ionThe hypochlorite ionThe chlorite ionThe chlorate ionThe 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. ISBN 0750633654. 
  2. ^ Cotton, F. Albert; Wilkinson, Geoffrey (1988), Advanced Inorganic Chemistry (5th ed.), New York: Wiley-Interscience, p. 564, ISBN 0-471-84997-9 
  • Kirk-Othmer Concise Encyclopedia of Chemistry, Martin Grayson, Editor, John Wiley & Sons, Inc., 1985
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