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Potassium Chromithiocyanate, K3[Cr(SCN)6]

Potassium Chromithiocyanate, K3[Cr(SCN)6].4H2O, prepared by boiling a solution of a chromic salt with potassium thiocyanate, forms reddish-violet glistening crystals, of density 1.71 at 16° C. The salt is stable in the air and over sulphuric acid, but when heated to 110° C. it loses its water of crystallisation, and at higher temperatures decomposes. It dissolves in water, 1 part in 0.72 parts of water, yielding a red solution, which on boiling goes green, but on cooling returns to its original colour. By crystallising from aqueous alcohol a trihydrate may be obtained.

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