Question

Name the gas obtained when rock salt reacts with conc. Sulphuric acid.

Answer 1

The gas obtains by reacting with conc. Sulphuric acid:

• Sulphuric acid is known as a very strong acid in nature that reacts with all types of bases to form their respective salts.
• Also Concentrated Sulphuric acid mainly works as a dehydrating agent, which discards water molecules from the compound and makes them dehydratrated.
• These reactions are generally known as dehydration reactions and the substance causing dehydration is known as the dehydrating agent.
• The reaction of rock salt or Sodium chloride and Sulphuric acid basically produces Hydrochloric gas as the by-product.
• The Hydrogen chloride gas produced, escapes from the medium which helps the reaction to not take place in a backward direction, and hence making the reaction irreversible.
• The rock salt or Sodium chloride reacts with Sulphuric acid to produce Sodium bisulfate and Hydrochloric gas, for which the reaction can be given as :

$\underset{\left(\mathrm{Rock}\mathrm{salt}\mathrm{or}\mathrm{Sodium}\mathrm{chloride}\right)}{\mathrm{NaCl}\left(\mathrm{s}\right)}+\underset{\left(\mathrm{Sulfuric}\mathrm{acid}\right)}{{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)}\stackrel{∆}{\to }\underset{\left(\mathrm{Sodium}\mathrm{bisulfate}\right)}{{\mathrm{NaHSO}}_4\left(\mathrm{aq}\right)}+\underset{\left(\mathrm{Hydrochloric}\mathrm{gas}\right)}{\mathrm{HCl}\left(\mathrm{g}\right)}$

Therefore, the gas obtained when rock salt reacts with concentrated Sulphuric acid: Hydrogen chloride gas.