In crystalline blue vitriol (), exactly how many water molecules are NOT coordinated to the metal center but are instead held strictly by hydrogen bonding?

Question

In crystalline blue vitriol ($CuSO_4 \cdot 5H_2O$), exactly how many water molecules are NOT coordinated to the metal center but are instead held strictly by hydrogen bonding?

Prashant Kotian · Accepted Answer

Correct answer: 1. In , the ion is coordinated to 4 water molecules to form a square planar complex. The 5th water molecule resides outside the coordination sphere and is held in the crystal lattice purely by hydrogen bonds to the coordinated waters and the sulfate ion.

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