Reversible Reactions & Equilibrium (Cambridge (CIE) IGCSE Chemistry)

Hydrated copper sulphate crystals, CuSO₄.5H₂O were heated in the apparatus shown below.

Indicate on the diagram using arrows

i) Where the copper sulphate crystals are placed

ii) Where heat is applied. 

What is the purpose of the ice? 

The crystals changed colour from ........................... to ..............................