Question

Explain with the help of the equations, how the following salts can be prepared in the laboratory:

(a) Zinc sulphate

Answer 1

Reaction Summary

• Dilute acid reacts with active metal and results in the formation of the required salt that is zinc sulphate $\left({\mathrm{ZnSO}}_4\right)$.
• It can be done using appropriate dilute acid, sulphuric acid$\left({\mathrm{H}}_2{\mathrm{SO}}_4\right)$ which reacts with Zinc $\left(\mathrm{Zn}\right)$ to form zinc sulphate $\left({\mathrm{ZnSO}}_4\right)$.

Balanced Reaction

• The chemical equation is as follows:

$$\begin{gathered} \mathrm{Zn}\left(\mathrm{s}\right)+{\mathrm{H}}_2{\mathrm{SO}}_4(\mathrm{dil}.)\to {\mathrm{ZnSO}}_4\left(\mathrm{aq}\right)+{\mathrm{H}}_2\uparrow \\ {\mathrm{ZnSO}}_4\left(\mathrm{s}\right)+7{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to {\mathrm{ZnSO}}_4.7{\mathrm{H}}_2\mathrm{O}\left(\mathrm{s}\right) \\ \mathrm{anhydrous}\mathrm{hydrated} \end{gathered}$$