A blue coloured salt of copper sulphate becomes white on heating. Give reason??
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Hydrated Copper Sulphate crystals [CuSO4.5H2O] are blue in colour.
When copper sulphate crystals are heated strongly, they loose all the water of crystallization and form anhydrous copper sulphate [which is white in colour].
CuSO4.5H2O ---------> CuSO4 + 5H2O
Hydrated Anhydrous
Copper sulphate Copper sulphate
The water of crystallisation gives the crystals of their salts their shape and colour.
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