The number of hydrogen bonded water molecules(s) associated with CuSO₄·5H₂O is:

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Accepted Answer

1. **Analyze the Structure:** Copper(II) sulphate pentahydrate ($CuSO_4 \cdot 5H_2O$) has a complex structure. The central Copper ion ($Cu^{2+}$) is coordinated to 4 water molecules forming a square planar coordination entity: $[Cu(H_2O)_4]^{2+}$.
2. **Identify Water Types:** 
   - 4 water molecules act as **ligands**, forming coordinate bonds with the copper ion.
   - The 5th water molecule acts as a bridge between the $[Cu(H_2O)_4]^{2+}$ cation and the $SO_4^{2-}$ anion. It is held in the crystal lattice solely by **hydrogen bonds**.
3. **Conclusion:** Therefore, only **1** water molecule is attached via hydrogen bonding, while the other 4 are coordinated.

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