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Cupric Cobalti-cyanide, Cu3[Co(CN)6]2

Cupric Cobalti-cyanide, Cu3[Co(CN)6]2, is obtained as a blue precipitate when potassium cobalti-cyanide is added in sufficient quantity to completely precipitate a copper sulphate solution. It is insoluble in acids, but readily soluble in ammonia. It is decomposed by hydrogen sulphide, copper sulphide being precipitated and hydrogen cobalti-cyanide remaining in solution, from which it can be obtained by concentration. The ammoniacal solution of this salt yields, on evaporation, small blue crystals of a diammoniate, Cu3[Co(CN)6]2.2NH3.5H2O.

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