Question

State one appropriate observation for : Conc. $H_{2}S{O}_4$ is added to a crystal of hydrated copper sulphate.

Answer 1

• Concentrated sulfuric acid is a dehydrating agent and it can remove water molecules from the blue crystals of hydrated copper $\left(II\right)$ sulphate $\left(CuS{O}_4.5H_{2}O\right)$ and leaves behind a white powder, which is anhydrous copper$\left(II\right)$ sulphate $\left(CuS{O}_4\right).$

$CuS{O}_4.5H_{2}O\stackrel{\text{conc.}{H}_{2}S{O}_4}{\to }Cus{O}_4+5H_{2}O$