CuSO4.5H2O is blue

Question:

 CuSO4.5H2O is blue while CuSO4 is colourless. Why?

Solution:

In CuSO4.5H2O, there are water molecules that act as ligands. The electrons will excite to higher d orbital and show colour. Whereas, in CuSO4, there are no water molecules to act as ligands, so no crystal field splitting happens.

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