Peroxosulfuric acids, H2S2O8 and H2SO5
المؤلف:
CATHERINE E. HOUSECROFT AND ALAN G. SHARPE
المصدر:
INORGANIC CHEMISTRY
الجزء والصفحة:
2th ed p 461
22-3-2017
2473
Peroxosulfuric acids, H2S2O8 and H2SO5
The reaction between cold, anhydrous H2O2 and chlorosulfonic acid yields peroxomonosulfuric acid, H2SO5, and peroxodisulfuric acid, H2S2O8 (scheme 1.1). Conversion of H2S2O8 (Table 15.8) to H2SO5 (1.1) occurs by controlled hydrolysis.
(1.1)
(1.1)
Both acids are crystalline solids at 298 K. Few salts of H2SO5 are known, but those of H2S2O8 are easily made by anodic oxidation of the corresponding sulfates in acidic solution at low temperatures and high current densities. Peroxodisulfates are strong oxidizing agents (equation 1.2), and oxidations are often catalysed by Ag, with Ag(II) species being formed as intermediates. In acidic olutions, [S2O8]2- oxidizes Mn2+ to [MnO4]- , and Cr3+ to [Cr2O7]2- .
(1.2)
Peroxodisulfuric acid smells of ozone, and when K2S2O8 is heated, a mixture of O2 and O3 is produced.
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