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A few crystals of copper-sulphate are heated in a dry boiling tube : (a) What is the colour before and after heating ?(b) What is the reason for the colour

change?(c) Can its original colour be restored? How?



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Before heating it was blue but after,it turned colourless (white).

This is because, CuSO4 crystals have water as part of their structure.OR, their actual formula is CuSO4.5H2O.When the blue crystals are heated the water of crystallisation is lost and what remains is anhydrous copper sulphate (CuSO4).

As this is a reversible reaction,it's colour can be restored by adding water to it

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