Question

Name the gas evolved (the formula is not acceptable). The gas is produced by the action of concentrated Sulphuric acid on Sodium chloride.

Answer 1

• Hydrogen chloride gas is produced when concentrated Sulphuric acid reacts with Sodium chloride. The chemical reaction takes place at temperatures below $\mathbf{200}\mathbf{°}\mathbf{C}$ .
• The reaction is shown below.
  $$\begin{gathered} \mathbf{NaCl}\mathbf{}\mathbf{\left(}\mathbf{s}\mathbf{\right)}\mathbf{}\mathbf{+}\mathbf{}{\mathbf{H}}_{\mathbf{2}}{\mathbf{SO}}_{\mathbf{4}}\mathbf{}\mathbf{}\mathbf{\left(}\mathbf{aq}\mathbf{\right)}\mathbf{}\stackrel{\mathbf{Below}\mathbf{}{\mathbf{200}}^{\mathbf{0}}\mathbf{C}}{\mathbf{\to }}\mathbf{}{\mathbf{NaHSO}}_{\mathbf{4}}\mathbf{}\mathbf{}\mathbf{\left(}\mathbf{s}\mathbf{\right)}\mathbf{}\mathbf{+}\mathbf{}\mathbf{HCl}\mathbf{}\mathbf{\left(}\mathbf{g}\mathbf{\right)}\mathbf{\uparrow }\mathbf{} \\ \mathbf{Sodium}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{Sulphuric}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{Sodium}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{Hydrogen}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{} \\ \mathbf{Chloride}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{acid}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{bisulphate}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{chloride}\mathbf{}\mathbf{} \end{gathered}$$
• Therefore, Hydrogen chloride gas is produced by the action of concentrated Sulphuric acid on Sodium chloride.