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is a crystalline chemical compound consisting of two or more simple salts
,
called compound salts. Compound salt is also called heavy salt. The compound salt contains some ions of similar size and suitable for the same lattic. For example, alum (aluminum sulfate potassium) is KAL (SO4) 2.12H2O, Mole salt (ammonium sulphate) is (NH4) 2Fe (SO4) 2.6H2O, and iron potassium (iron sulfate potassium sulphate) is KFe (SO4) 2.12H2O. When complex salts dissolve in water, the ionized ions are the same as the simple salt ions that make up it. The two simple salts can be crystallized from a mixture of saturated solutions, which can be resalted. For example, the solution of CuSO4 and (NH4) 2SO4 is mixed and crystallized to make ammonium sulfate (NH4) 2SO4. CUSO4·6H2O]。