When a solution of sodium sulphate is added to a solution of barium chloride, a white precipitate appears. The white precipitate is due to formation of:
Barium sulphate
A white precipitate is formed due to the formation of barium sulphate while sodium chloride remains in the solution. The reaction is:
Barium chloride + Sodium sulphate → Barium sulphate(s) + Sodium chloride(aq)