Question

Making use one of substances chosen from those given below:

Dilute sulphuric acid

Sodium carbonate

Zinc

Sodium sulphite

Lead

Calcium carbonate

Give the equations for the reactions by which you could obtain:

zinc carbonate (two steps required)

Answer 1

1. Step I By choosing dilute sulphuric acid $\left({\mathrm{H}}_2{\mathrm{SO}}_4\right)$from the given list and reacting it with zinc$\left(\mathrm{Zn}\right)$, zinc sulphate $\left({\mathrm{ZnSO}}_4\right)$ is formed.
2. $$\begin{gathered} \mathrm{Zn}\left(\mathrm{s}\right)+{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{l}\right)\to {\mathrm{ZnSO}}_4\left(\mathrm{l}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right) \\ \left(\mathrm{Zinc}\right)(\mathrm{Zinc}\mathrm{sulphate}) \end{gathered}$$
3. Step II Zinc sulphate $\left({\mathrm{ZnSO}}_4\right)$on reaction with sodium carbonate $\left({\mathrm{Na}}_2{\mathrm{CO}}_3\right)$gives zinc carbonate $\left({\mathrm{ZnCO}}_3\right)$
4. $$\begin{gathered} {\mathrm{Na}}_2{\mathrm{CO}}_3\left(\mathrm{s}\right)+{\mathrm{ZnSO}}_4\left(\mathrm{l}\right)\to {\mathrm{Na}}_2{\mathrm{SO}}_4\left(\mathrm{l}\right)+{\mathrm{ZnCO}}_3\left(\mathrm{s}\right) \\ (\mathrm{Sodium}(\mathrm{Zinc} \\ \mathrm{carbonate})\mathrm{carbonate}) \end{gathered}$$