Question

On heating hydrated Copper Sulphate, it turns ______ colour.

Answer 1

Heating Hydrated Copper Sulphate:

• The chemical formula of hydrated Copper sulphate is ${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$.
• It contains five molecules of water of crystallization and appears as blue-colored crystals.
• On heating changes from blue to white and the crystalline form changes to amorphous.

$\underset{\mathrm{Hydrated}\mathrm{Copper}\mathrm{Sulphate}}{{\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}\left(\mathrm{s}\right)}\to \underset{\mathrm{Copper}\mathrm{Sulphate}}{{\mathrm{CuSO}}_4\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{5{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)}$

• On heating, blue-coloured copper sulphate crystals become white.

Therefore, On heating hydrated copper sulphate, it turns white colour.