Question

When we put copper sulphate in water, after sometime we find the solution turns blue. Why? Also on

heating it, what change will occur?​

Answer 1

When we put copper sulphate in water, it reacts with water to form hydrated copper sulphate, which is blue in colour.

CuSO4(s) + 5H2O(l) --> CuSO4.5H2O(s)

On Heating, hydrated copper sulphate will again change in copper sulphate and water.

CuSO4.5H2O(s) --> CuSO4(s) + 5H2O(l)