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Dithiocyanic Acid, (HCNS)2

Dithiocyanic Acid, (HCNS)2, is obtained by decomposing its potassium salt with sulphuric acid. The potassium salt is formed when perthiocyanic acid (see below) is treated with a cold aqueous solution of potassium hydroxide. It is a dark yellow powder, slightly soluble in cold water, more soluble in hot water; it is soluble in alcohol and in ammonia. Aqueous and alcoholic solutions made in the cold do not colour ferric salts.

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