What happens when an aqueous solution of sodium sulphate reacts with barium chloride? State the physical conditions of reactants in which the reaction between them will not take place.
a) Sodium sulphate precipitates out of the solution
b) Barium sulphate precipitates out of the solution
c) Sodium chloride precipitates out of the solution
d) Barium chloride precipitates out of the solution
