sodium sulphite react with HCl

Sodium sulphite reacts with hydrochloric acid to give sodium chloride solution, water and sulphur dioxide gas.
Na2SO3 + 2HCl → 2NaCl + H2O + SO2

This is one of the chemical properties of acids that a dilute acid can react with a sulphite to give sulphur dioxide. The reaction is similar to that a dilute acid reacts with a carbonate to give carbon dioxide, e.g.
Na2CO3 + 2HCl → 2NaCl + H2O + CO2

Na2SO3 + 2HCl → 2NaCl + H2O + CO2
O.N. of Na in Na2SO3 = O.N. of Na in NaCl = +1
O.N. of S in Na2SO3 = O.N. of S in SO2 = +4
O.N. of O in Na2SO3 = O.N. of O in H2O/SO2 = -2
O.N. of H in HCl = O.N. of H in H2O = +1
O.N. of Cl in HCl = O.N. of Cl in NaCl = -1
There is no change in oxidation number (O.N.), and thus the reaction is NOT redox.
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