Question

On heating copper sulphate ( blue colour) crystals turn colourless. Why? Give reason.

Answer 1

Hydrated copper sulphate (blue)    →←    anhydrous copper sulphate (white) + water
CuSO4.5H2O (s) ⇌ CuSO4 (s) + 5H2O (g) on heating copper sulphate the hydrous / hidrated crystals of copper change into coloueless cause the 5 water molecules assioted with it evaprates and copper sulphate tuens anyhydrous  thus changing in to clourless