Copper sulfate, inorganic compound, chemical formula CuSO4, white powder, soluble in water, methanol, insoluble in ethanol, aqueous solution is weak acid, blue. But when crystallized from an aqueous solution, blue copper pentahydrate sulfate (CuSO4·5H2O, also known as alum) is produced. This principle can be used to test the existence of water. After losing the crystallization of heat decomposition, at room temperature and pressure is very stable, not deliquescent, in dry air will gradually weathering.
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