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Nickel Cobalti-cyanide, Ni3[Co(CN)6]2

Nickel Cobalti-cyanide, Ni3[Co(CN)6]2.12H2O, may be obtained by precipitating a nickel salt with hydrogen cobalti-cyanide or with the potassium salt. In the latter case the precipitate is not pure, but contains potassium cobalti-cyanide. The salt is bright blue in colour, insoluble in water and acids. With ammonia it yields a blue solution from which crystals of the ammoniate, Ni3[Co(CN)6]2.2NH3.7H2O, may be obtained on concentration.

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