Potassium hexacyanocobaltate analysis

Potassium hexacyanocobaltate(III) crystals have a faint yellow color and belong to the monoclinic system. Their specific gravity is 1.906. The compound is not appreciably hydrolyzed iii solution, but concentrated mineral acids decompose it. On heating to moderately high temperatures it melts, with decomposition, to an olive-green mass. The crystals are very soluble in water at room temperature, only very slightly soluble in liquid ammonia at —33°, and insoluble in alcohol. The preparation of potassium hexacyanocobaltate(III) is sometimes used in qualitative analysis in the separation of cobalt and nickel. 

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