peroxosulphuric(VI) acid

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The term commonly refers to peroxomonosulphuric(VI) acid, H2SO5, which is also called permonosulphuric(VI) acid and Caro's acid. It is a crystalline compound made by the action of hydrogen peroxide on concentrated sulphuric acid. It decomposes in water and the crystals decompose, with melting, above 45°C. The compound peroxodisulphuric acid, H2S2O8, also exists (formerly called perdisulphuric acid). It is made by the high-current electrolysis of sulphate solutions. It decomposes at 65°C (with melting) and is hydrolysed in water to give the mono acid and sulphuric acid. Both peroxo acids are very powerful oxidizing agents. See also sulphuric acid (for structural formulas).

Subjects: Chemistry.

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