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| Section2 = }} 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 is stable. One example of a salt of this anion is the well-known sodium chlorite. This and related salts are sometimes used in the production of chlorine dioxide. ==Preparation== HClO2 can be prepared through reaction of barium chlorite and dilute sulfuric acid: :Ba(ClO2)2 + H2SO4 → BaSO4 + 2HClO2 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「chlorous acid」の詳細全文を読む スポンサード リンク
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