The copper (II) sulfate crystals that you see in the lab are obviously blue in colour. The same goes for the copper (II) sulfate solution. This is because copper (II) sulfate is hydrated, meaning to say it has water of crystallisation attached to the salt.
CuSO4.5H2O -----------------------> CuSO4 + 5H2O
Once you heat the copper (II) sulfate crystals, they will lose the water of crystallisation, thus forming white powder. Copper (II) sulfate is said to be 'anhydrous', meaning 'dry'.
Anhydrous copper (II) sulfate powder is also used to test for the presence of water.
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