Question

Write the balanced chemical equation to prepare ammonia gas in the laboratory by using an alkali.

Answer 1

Chemical reaction of the preparation of Ammonia gas$\left({\mathrm{NH}}_3\right)$ in laboratory by using an alkali:-

$$\begin{gathered} 2{\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{s}\right)+\mathrm{Ca}{\left(\mathrm{OH}\right)}_2\left(\mathrm{s}\right)\to {\mathrm{CaCl}}_2\left(\mathrm{s}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)+2{\mathrm{NH}}_3\left(\mathrm{g}\right) \\ \mathrm{Ammonium}\mathrm{Calcium}\mathrm{Calcium}\mathrm{water}\mathrm{Ammonia} \\ \mathrm{chloride}\mathrm{hydroxide}\mathrm{chloride}\mathrm{gas} \end{gathered}$$

Here, in this reaction Ammonium chloride$\mathbf{\left(}{\mathbf{NH}}_{\mathbf{4}}\mathbf{Cl}\mathbf{\right)}$ is reacting with the base i.e., Calcium hydroxide$\mathbf{\left(}\mathbf{Ca}{\mathbf{\left(}\mathbf{OH}\mathbf{\right)}}_{\mathbf{2}}\mathbf{\right)}$ and producing Calcium chloride$\mathbf{\left(}{\mathbf{CaCl}}_{\mathbf{2}}\mathbf{\right)}$, water$\mathbf{\left(}{\mathbf{H}}_{\mathbf{2}}\mathbf{O}\mathbf{\right)}$ and Ammonia gas$\left({\mathrm{NH}}_3\right)$ is evolved.