Why does copper sulphate solution not evaporate when heated?

When heated blue copper sulphate solution does evaporate!!!!

The result is BLUE copper sulphate crystals of the penta-hydrate (CuSO4.5H2O).

If you continue to heat these blue crystals, they will turn white in colour as you drive off the water of hydration.

CuSO4.5H2O(s)(Blue) ==heat==> CuSO4(s)(white) + 5H2O(g)

The analogy of hydration is like holding a ball in your hand. Your hand is the copper sulphate, and the ball is the water. Open your hand (heat) and the ball falls away(water is released).

Your hand and the ball remain separate objects (NOT combined). Similarly the copper sulphate and the water remain separate molecules (NOT combined). It's just that the one is held (in the crystal lattice), by the other.,