On adding a drop of barium chloride solution to an aqueous solution of sodium sulfite, a white precipitate is obtained.
(c) On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?
On adding a drop of barium chloride solution to an aqueous solution of sodium sulfite, a white precipitate is obtained.
(c) On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?

Solution:

c) When we add dilute HCl to this reaction mixture, we get the following products: barium chloride, sulphur dioxide, and water. Due to the fact that barium chloride is a soluble substance, the white precipitate will be rendered inert.

\mathrm{BaSO}_3+\mathrm{HCl} \longrightarrow \mathrm{BaCl}_3+\mathrm{SO}_2+\mathrm{H}_2 \mathrm{O} .