Copper sulphate crystal leaves white residue on heating why?
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Blue copper(II) sulphate crystals are hydrated- referred to as copper(II) sulphate pentahydrate. Pentahydrate copper(II) sulphate is blue in color.
On the other hand, anhydrous copper (II) sulphate (no water of crystallization) is white.
Therefore when you heat the pentahydrate copper (II) sulphate, it loses its water of crystallization and a white anhydrous copper (II) sulphate is formed.
The reaction is as follows:
heat
CuSO4.5H2O -------------------> CuSO4 + 5H2O
On the other hand, anhydrous copper (II) sulphate (no water of crystallization) is white.
Therefore when you heat the pentahydrate copper (II) sulphate, it loses its water of crystallization and a white anhydrous copper (II) sulphate is formed.
The reaction is as follows:
heat
CuSO4.5H2O -------------------> CuSO4 + 5H2O
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