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copper(II) sulphate
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Copper(II) Sulphate
Substance usually found as a blue, crystalline, hydrated salt CuSO4.5H2O (also called blue vitriol). It is made from the action of dilute sulphuric acid on copper(II) oxide, hydroxide, or carbonate.
When the hydrated salt is heated gently it loses its water of crystallization and the blue crystals turn to a white powder. The reverse reaction is used as a chemical test for water.
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