Chlorous acid

Chlorous acid
Chlorous acid
CAS number 13898-47-0 YesY
PubChem 24453
ChemSpider 22861 YesY
KEGG C01486 YesY
ChEBI CHEBI:29219 YesY
Jmol-3D images Image 1
Molecular formula HClO2
Molar mass 68.46 g/mol
Acidity (pKa) 1.96
 YesY acid (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Chlorous acid is an inorganic compound with the formula HClO2. It is a weak acid. Chlorine has oxidation state +3 in this acid. The pure substance is unstable, disproportionating to hypochlorous acid (Cl oxidation state +1) and chloric acid (Cl oxidation state +5):

2 HClO2 → HClO + HClO3

Although the acid is difficult to obtain in pure substance, the conjugate base, chlorite, derived from this acid are stable. One example is the salt is well known sodium chlorite. This and related salts are sometimes used in the production of chlorine dioxide.


HClO2 can be prepared through reaction of barium chlorite and dilute sulfuric acid:

Ba(ClO2)2 + H2SO4 → BaSO4 + 2HClO2


Chlorous acid is a powerful oxidizing agent, although its tendency to disproportionation counteracts its oxidizing potential.

Chlorine is the only halogen to form an isolable acid of formula HXO2.[1] Fluorine resists oxidation above the 1+ level. Neither bromous acid nor iodous acid have been isolated. A few salts of bromous acid, bromites, are known, but no iodites.[1]


Media related to Chlorous acid at Wikimedia Commons

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

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Look at other dictionaries:

  • chlorous acid — HClO2; an acid forming chlorites with bases. * * * chlorous acid n a strongly oxidizing acid HClO2 known only in solution and in the form of its salts (as the chlorite of sodium) * * * chlo·rous ac·id (klorґəs) a weak inorganic acid, HClO2 …   Medical dictionary

  • chlorous acid — chlorito rūgštis statusas T sritis chemija formulė HClO₂ atitikmenys: angl. chlorous acid rus. хлористая кислота ryšiai: sinonimas – vandenilio dioksochloratas (1–) …   Chemijos terminų aiškinamasis žodynas

  • chlorous acid — a hypothetical acid, HClO2, known only in solution or in the form of its salts. [1835 45] * * * …   Universalium

  • chlorous acid — noun an unstable acid, HClO, known only in solution or as its salts, the chlorites; it is a strong oxidizing agent …   Wiktionary

  • chlorous acid — [ klɔ:rəs] noun Chemistry a weak acid with oxidizing properties, formed when chlorine dioxide dissolves in water. [HClO2.] …   English new terms dictionary

  • chlorous acid — n. Chem. a pale yellow liquid acid with oxidizing properties. Usage: Chem. formula: HClO2 Etymology: CHLORO + OUS …   Useful english dictionary

  • Chlorous — Chlo rous, a. [See {Chlorine}.] 1. Of, pertaining to, or derived from, chlorine; said of those compounds of chlorine in which this element has a valence of three, the next lower than in chloric compounds; as, chlorous acid, {HClO2}. [1913… …   The Collaborative International Dictionary of English

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  • chlorous — 1. Relating to chlorine. 2. Denoting compounds of chlorine in which its valence is +3; e.g., c. acid. * * * chlo·rous klōr əs, klȯr adj relating to or obtained from chlorine esp. with a valence of three * * * chlo·rous (klorґəs) derived… …   Medical dictionary

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