Question

what colour change take place on mixing auqeous solution of Barium Chloride and sodium sulphate ? why?

Answer 1

For example, on mixing a solution of barium chloride with sodium sulphate, a white precipitate of barium sulphate is immediately formed. These reactions are ionic in nature. The reactants changes into ions when dissolved in water and there is an exchange of ions in solution. This results in the formation of product molecule.