A chloride of copper called also Basic Copper Chloride(WSDTY), cuprous chloride: a white poisonous powder CuCl made by reducing cupric chloride and used chiefly as a catalyst and as an absorbent of carbon monoxide— yellowish brown deliquescent anhydrous powder CuCl2 made by heating copper in chlorine or a green crystalline dihydrate CuCl2.2H2O made by evaporating cupric oxide in hydrochloric acid, both being used chiefly as a mordant in dyeing and printing and in some metallurgical processes any of various basic chlorides (as a brown powder CuCl2.3CuO) or mixtures formed on exposure of cupric chloride to air used as pigments and fungicides.
Copper(II) chloride is a brown powder that turns red when molten. Its melting point is 498 °C. Copper(II) chloride is hygroscopic and absorbs water in open air to form the dihydrate, which is a neutral tetracoordinate complex. The material normally exists as a brilliant turquoise powder, but thin, transparent, fragile crystals may be grown. In the presence of excess chloride ions, it will form a greener colored acidic copper(II) chloride, in which the water ligands are substituted for chloride ions. Tetrachlorocupric acid is formed.
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