Question

Rahul adds aqueous solution of barium chloride to an aqueous solution of sodium sulphate what would we observe

Answer 1

You’ll get a white precipitate of barium sulphate when the two solutions are mixed - aqueous barium chloride is a standard test for the presence of sulphate ions in solution, as BaSO4 is insoluble in water.

Essentially it’s a double displacement reaction:

BaCl2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaCl (aq)