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Sulphate of Copper

The blue vitriol of commerce is obtained from the na- 4087. Tests for Solutions of Platinum. Sulphuretted hydrogen throws down from neutral and acid solutions of platinum, tive sulphuret of copper (copper pyrites). a blackish-brown precipitate, which is only Pure sulphate of copper is made by the direct, formed after a time in the cold, but imme- solution of the metal, or preferably, of its diately on heating the liquid. Sal-ammoniac oxide or carbonate, in sulphuric acid. It conand chloride of potassium give yellow crys- sists of fine blue crystals, slightly efflorescent talline precipitates, insoluble in acids, but in the air. By heat it loses its water of cryssoluble in excess of the precipitant, upon the tallization and crumbles into a white powder. application of heat, and decomposable by heat, (See No. 120.) with production of spongy platinum. Ammonia and potassa also give similar precipi-