State how hydrogen chloride gas can be obtained from tetraoxosulphate (6) acid

1 answer

Hydrogen chloride gas can be obtained from tetraoxosulphate (6) acid (sulphuric acid) by reacting it with sodium chloride (common salt) in a process known as the Deacon process.

The reaction can be represented as follows:

NaCl + H2SO4 → NaHSO4 + HCl

Hydrogen chloride gas is then obtained by heating the mixture of sodium hydrogen sulfate (sodium bisulfate) and hydrochloric acid.