Question

What is the theory behind the precipitation reaction between aqueous solution of barium chloride and aqueous solution of sodium sulphate?

CBSE Class X Science SA 1 ( 2 marks)

Answer 1

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.

Answer 2

Answer: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.