Why does copper sulfate pentahydrate change colour upon heating?

1 Answer
anor277
Nov 20, 2016

Because a chemical reaction has taken place, colour change is the prime means to determine the fact of chemical change (of course there are chemical reactions that proceed WITHOUT colour change).

Explanation:

And we can represent this reaction by the following chemical equation:

#underbrace(CuSO_4*5H_2O(s))_"beautiful blue"+Delta rightleftharpoons underbrace(CuSO_4(s))_"white salt" + 5H_2O(g)uarr#

Copper sulfate is different and distinct to copper sulfate pentahydrate; thus the salts should have different properties and different colours, and indeed they do.

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