Bromous acid

Bromous acid
Space-filling model of the bromous acid molecule
Names
IUPAC names
hydroxy-λ3-bromanone
hydroxidooxidobromine
bromous acid
Identifiers
37691-27-3 N
ChEBI CHEBI:29247 YesY
ChemSpider 145144 YesY
Jmol interactive 3D Image
PubChem 165616
Properties
HBrO2
Molar mass 112.911 g/mol
Related compounds
Other anions
Hydrobromic acid; hypobromous acid; bromic acid; perbromic acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Bromous acid is an acid with the formula HBrO2. It has bromine in the +3 oxidation state. The salts of bromous acid are called bromites. The acid is not stable and only occurs as an intermediate; for example, in the oxidation of hypobromites.[1]

Chemistry

Bromous acid can be produced by classical chemical or electrochemicals method via anodic oxidation.

HBrO + HClO HBrO2 + HCl

Also disproportioning of hypobromous acid will give bromous acid and hydrobromic acid.

2 HBrO HBrO2 + HBr

Lastly, a synproportion reaction of bromic acid and hydrobromic acid gives bromous acid.

2 HBrO3 + HBr 3 HBrO2

Compounds

Several bromites are stable and have been isolated. For example NaBrO2· 3H2O and Ba(BrO2)2·H2O.[1]

Use

Bromites can be used for the reduction of permanganates to manganates.[1]

2MnO
4
+ BrO
2
+ OH → 2MnO2−
4
+ BrO
3
+ H2O

References

  1. 1 2 3 Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier ISBN 0-12-352651-5


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