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Atomistry » Sulphur » Compounds » Perdisulphates | ||||
Atomistry » Sulphur » Compounds » Perdisulphates » |
Perdisulphates
As in the electrolytic formation of perdisulphuric acid, the first anodic product is the discharged HSO4' ion, which by coupling then gives rise to perdisulphuric acid. If the metal perdisulphate is less soluble than the acid sulphate, it crystallises from the solution; this is the case in the electrolysis of a concentrated solution of potassium or ammonium hydrogen sulphate,8 the changes in the case of the latter salt being as follows: HSO4' + + = HSO4, 2HSO4 = H2S2O8, H2S2O8 + (NH4)HSO4 = (NH4)2S2O8 + 2H2SO4. Ammonium perdisulphate has also been prepared by passing fluorine into a cold saturated aqueous solution of ammonium hydrogen sulphate; ozonised oxygen escapes as oxidation proceeds and crystals of the persulphate slowly separate. The perdisulphates of the alkaline earth metals may be prepared by grinding together, with a little water, molecular proportions of the metal oxide and ammonium perdisulphate, and drying the mixture in a vacuum. The resulting mass is carefully powdered and the metal perdisulphate extracted by solution in absolute alcohol, from which it may be obtained by the addition of absolute ether, or by evaporation in a vacuum. |
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