It can be used in water solubility identification of identifying Basic Copper Chloride or copper sulfate, for cupric chloride and cupric subcarbonate are insoluble in water. Identification of basic cupric chloride and cupric subcarbonate, can take a small amount of two powder dissolved in excess nitrate, copper carbonate will produce carbon dioxide. If this phenomenon is not a good judge, add to two of the nitrate solution dropping silver nitrate solution and nitric acid solution of tribasic copper chloride, which will produce white silver chloride precipitation. It means that chloride is in the pale green precipitate.
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