Question

CUSO4.5H2O is blue in colour while CUSO4 is colourless why ????????? rply fast

Answer 1

These are hydrated salts that means water presence gives them color. so, CuSO4 remains colorless

Answer 2

Hey !!

In CuSO₄.5H₂O water acts as ligand as a result it causes crystal field splitting. Hence, d-d transition is possible in CuSO₄.5H₂O and shows colour. In the anhydrous CuSO₄ due to the absence of water (ligand), crystal field splitting is not possible and hence it is colourless.

Hope it helps you !!