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Question

what is the theory behind the precipitaion reaction between aqueous solution of barium chloride and aqueous solution of sodium sulphate?

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Solution

Dear student,
When a solution of sodium sulphate is mixed with a solution of barium chloride, the following double displacement reaction takes place : Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq) In this reaction, sulphate ions from sodium sulphate are displaced by chloride ions (Cl– ), and chloride ions in barium chloride are displaced by sulphate ions. As a result, a white precipitate of barium sulphate is formed and sodium chloride remains in the solution.

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