Chlorous acid

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Structural formula
Structure of chlorous acid
Surname Chlorous acid
other names

Chloro (III) acid

Molecular formula HClO 2
Brief description

only stable in aqueous solution

External identifiers / databases
CAS number 13898-47-0
PubChem 24453
ChemSpider 22861
Wikidata Q407495
Molar mass 67.44 g mol −1
pK s value



soluble in water

safety instructions
GHS hazard labeling
no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

The chlorous acid is one of the oxygen-containing acids of chlorine. Since it decomposes rapidly in water, chlorine dioxide and hydrochloric acid even in a dilute cold solution , it is of little importance in its free form.

The salts of chlorous acid are the chlorites . Compared to free acid, they are more stable and can be isolated in pure form, but they are reactive substances and effective oxidizing agents , which must be taken into account when handling.


Chlorous acid is obtained by reacting barium chlorite and sulfuric acid . Barium sulfate precipitates as a by-product .

Individual evidence

  1. ^ A b c A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 .
  2. This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

Web links

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