Question

What is the decomposition of ${\mathrm{FeSO}}_4$?

Answer 1

Decomposition reaction

• On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate $\left({\mathrm{FeSO}}_4\right)$ is formed. So their color changes from light green to white.

Example

• Ferrous sulphate $\left({\mathrm{FeSO}}_4\right)$ in presence of heat breaks down into ferric oxide $\left({\mathrm{Fe}}_2{\mathrm{O}}_3\right)$, sulpur dioxide $\left({\mathrm{SO}}_2\right)$ and sulfur trioxide $\left({\mathrm{SO}}_3\right)$.
• The chemical reaction is as follows,

$2{\mathrm{FeSO}}_4\left(\mathrm{s}\right)\stackrel{\mathrm{heat}}{\to }{\mathrm{Fe}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)+{\mathrm{SO}}_2\left(\mathrm{g}\right)+{\mathrm{SO}}_3\left(\mathrm{g}\right)$