Bromous acid

Bromous acid

Names
IUPAC names hydroxy-λ^3-bromanone hydroxidooxidobromine bromous acid
Identifiers
CAS Number	37691-27-3
ChEBI	CHEBI:29247
ChemSpider	145144
Jmol interactive 3D	Image
PubChem	165616
InChI InChI=1S/BrHO2/c2-1-3/h(H,2,3) Key: DKSMCEUSSQTGBK-UHFFFAOYSA-N InChI=1/BrHO2/c2-1-3/h(H,2,3) Key: DKSMCEUSSQTGBK-UHFFFAOYAC
SMILES O=BrO
Properties
Chemical formula	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).
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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. Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier ISBN 0-12-352651-5