Question

1. What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride?
2. Write the balanced chemical equation for the reaction which takes place.
3. State the physical conditions of reactants in which the reaction will not take place.
4. Name the type of chemical reaction which occurs.
5. Give one example of another reaction which is of the same type as the above reaction.

Answer 1

1. When aqueous sodium sulphate reacts with aqueous barium chloride, a white, insoluble precipitate of barium sulphate forms, along with a solution of sodium chloride.
2. \[\ce{Na2SO4_{(aq)} + BaCl2_{(aq)} -> BaSO4_{(s)} + 2NaCl_{(aq)}}\]
3. The reaction will not take place when sodium sulphate and barium chloride are in the solid (dry) state, because ions are not free to move and exchange.
4. Double displacement reaction
5. \[\ce{Pb(NO3)2_{(aq)} + 2KI_{(aq)} -> PbI2_{(s)} + 2KNO3_{(aq)}}\]