Question

The following questions are pertaining to the laboratory preparation of Hydrogen chloride gas.

Write the equation for the preparation mentioning the condition required.

Answer 1

• The Hydrogen chloride ($\mathbf{HCl}$) is prepared in the laboratory by maintaining a suitable temperature.
• A temperature is below $200°C$ is necessary for the perfect preparation.
• In the laboratory Hydrogen chloride is prepared by the reaction of Conc. Sulphuric acid (${\mathbf{H}}_{\mathbf{2}}{\mathbf{SO}}_{\mathbf{4}}$) with Sodium chloride ($\mathbf{NaCl}$).
• The equation that is present in the laboratory preparation is, $$\begin{gathered} \mathrm{NaCl}\left(s\right)+{\mathrm{H}}_2{\mathrm{SO}}_4(conc\mathit{.})\to {\mathrm{NaHSO}}_4\left(s\right)+\mathrm{HCl}\left(g\right)\uparrow \\ \mathrm{Sodium}\mathrm{Sulphuric}\mathrm{Sodium}\mathrm{Hydrogen} \\ \mathrm{chloride}\mathrm{acid}\mathrm{hydrogen}\mathrm{chloride} \\ \mathrm{sulfate} \end{gathered}$$
• Sodium chloride reacts with Sulphuric acid to form Sodium bisulphate or Sodium hydrogen sulphate and Hydrogen chloride.