In solid CuSO₄.5H₂O copper is coordinated to how many water molecules

In CuSO4.5H₂O, four water molecules are coordinated with Cu²⁺ while one of water molecule bonded with ${\mathrm{SO}}_4^{2-}.$

In copper sulfate pentahydrate, the oxidation state of Cu is +2 and the geometry becomes distorted octahedral.