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Copyright © Tarek Kakhia. All rights reserved. http://tarek.kakhia.org 1 . Introduction : Chlorous acid Chlorous acid is a chemical compound with the formula HClO2 It is a weak acid. Chlorine possesses oxidation state +3 in this acid. The pure substance is unstable, disproportionating to hypo chlorous acid ( Cl oxidation state +1) and chloric acid ( Cl oxidation state +5) : 2 H ClO2 (aq) → H ClO (aq) + H ClO3 (aq) Chlorite salts such as sodium chlorite are stable conjugate bases derived from this acid. These salts are sometimes used in the production of chlorine dioxide. 2 . Preparation HClO2 can be prepared through reaction of barium chlorite and dilute sulfuric acid: Ba ( ClO2 ) 2 + H2 SO4 → Ba SO4 + 2 H ClO2 3 . Stability Chlorine is the only one of the four halogens to form an isolable acid of formula HXO2 . Fluorine does not have the bonding capacity to do so, whereas the hypothetical bromous acid and iodous acid have never been isolated and only a few salts of bromous acid, bromites, are known, and no iodites . Molecular Formula H Cl O2 MolarMass 68.5 g / mol Acidity ( pKa ) 1.96 22PDF Image | Chlorine Characteristics
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