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It changes anhydrous blue copper(11)sulphate to hydrated white copper(11) sulphate
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Boil it and check the boiling point

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Add some drops of the liquid in a white anhydrous copper(||) sulphate. If it turns from white to blue, the liquid is pure water.
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Put the suspected liquid in blue anhydrous cobalt(ıı)chloride. The suspected liquid turns blue anhydrous cobalt (ıı)chloride to pink hydrated cobalt(ıı)chloride

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