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Question
On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained :
- Write a balanced chemical equation for the reaction involved.
- What other name can be given to this precipitation reaction?
- On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?
Solution
- `"BaCl"_2("aq") + "Na"_2"SO"_3("aq") -> underset("(White ppt.)")("BaSO"_3("s")) + 2"NaCl"("aq")`
- he precipitation reaction is also called double displacement reaction.
- White precipitate of barium sulphite reacts with dilute hydrochloric to form barium chloride and sulphur dioxide gas. Since barium chloride is water soluble, the white precipitate will slowly disappear.
`underset("(White ppt.)")(underset("Barium sulphite")("BaSO"_3("s"))) + 2"HCl"(aq") -> underset("Water soluble")("BaCl"_2("aq")) + "H"_2"O"("l") + "SO"_2("g")`
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