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+1 vote
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in Chemistry by (79.0k points)

CuSO4.5H2O is blue in color while CuSO4 is colorless. Why? 

1 Answer

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In CuSO4.5H2O,water acts as ligand as a result it causes crystal field splitting.

Hence d-d transition is possible in field splitting is CuSO4.5H2O and shows color. 

In the anhydrous CuSO4 due to the absence of water (ligand), crystal not possible and hence no color. 

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