Question

Write the equation for :
The preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute.

Answer 1

\[\ce{\underset{\text{Sodium chloride}}{NaCl} + \underset{\text{Sulphuric acid(Conc.)}}{H2SO4} ->[<200°C] \underset{\text{Sodium hydrogen sulphate}}{NaHSO4} + \underset{\text{Hydrogen chloride gas}}{HCl}}\]