Aqueous solutions of sodium chloride, sodium sulphate and calcium chloride are taken in three separate test tubes. Using aqueous barium chloride how do you identify sodium sulphate?

Aqueous solutions of sodium chloride, sodium sulphate and calcium chlo

1.	Aqueous solutions of sodium chloride, sodium sulphate and calcium chloride are taken in three separate test tubes. Using aqueous barium chloride how do you identify sodium sulphate?
Answer» Solution :When a solution of sodium sulphate is added to a solution of barium CHLORIDE a white precipitate of barium sulphate will be FORMED immediately. This precipitate is insoluble in dil-Hydrochloric acid and also insoluble in WATER. This type of REACTION is CALLED precipitation reaction as the `BaSO_4`precipitate thus formed is of white colour. `Na_2 SO_4 (aq) + BaCl_2 (aq) to BaSO_4(s) + 2NaCl(aq)` Since, barium sulphate is insoluble in water. So it will precipitate as a solid, whereas the sodium chloride will remain in solution.