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Salts of Auricyanic Acid

The free acid has not been prepared, as it decomposes as indicated under auric cyanide. Potassium auricyanide, 2KAu(CN)4,3H2O, is obtained in colourless crystals by the action of auric chloride on potassium cyanide in aqueous solution. It is readily soluble in water. At 200° C. all the water of crystallization is eliminated, the salt being converted into potassium aurocyanide, KAu(CN)2. Ammonium auricyanide, NH4Au(CN)4,H2O, is produced by evaporating a solution of auric hydroxide in ammonium cyanide. It forms large plates, readily soluble in water. At 100° C. the water of crystallization is expelled, and at higher temperatures the salt decomposes. The silver salt is produced as a yellowish precipitate, sensitive to light, by the action of silver nitrate on potassium auricyanide. It is readily soluble in ammonia, and much less readily in nitric acid. A cobaltous auricyanide, Co(Au(CN)4)2,9H2O, and a number of complex salts have been prepared.

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