Action of concentrated sulphuric acid on blue vitriol.
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Concentrated sulfuric acid is a particularly strong dehydrating agent and in contact with CuSO4. 5H2O it dehydrates the blue crystals and leaves anhydrous, but white, copper(II) sulfate.
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Concentrated Sulphuric acid acts as dehydrating agent and removes the water of crystallisation from hydrated copper sulphate to produce anhydrous copper(II) sulfate. The reaction is reversible. Hydrated copper sulphate is blue in colour. Anhydrous copper sulphate is colourless/white
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