Question

how aqueous soln of hcl is prepared in the laboratory from nacl

Answer 1

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Preparation of Hydrochloric Acid

Hydrochloric acid (HCl) can be produced in any of the following ways:

(a). By heating sodium chloride (NaCl) with concentrated H2SO4.

The gas (HCl) produced is dried by passing it into conc. H2SO4

H2SO4(aq) + NaCl(s) → NaHSO4(s), + HCl(g)

The above reaction will also occur in the cold state - Laboratory preparation.

Application of heat produces large quantity of the gas - industrial preparation.

A solution of the gas is obtained by dissolving it in water.

(b). Another method for producing hydrochloric acid is by direct combination of chlorine and hydrogen.