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In which of the following compounds are BOTH coordinated water molecules AND hydrogen-bonded water molecules present?

1. BaCl2 * 2H2O
2. [Cr(H2O)6]Cl3
3. CuSO4 * 5H2O
4. All of these

Correct answer: CuSO4 * 5H2O

Solution

In CuSO4 * 5H2O, four H2O molecules are directly coordinated to Cu²+ and one H2O is held by hydrogen bonds to the SO4²- ion, making it the only compound in the list that contains both types simultaneously.

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