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Question
- What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride?
- Write the balanced chemical equation for the reaction which takes place.
- State the physical conditions of reactants in which the reaction will not take place.
- Name the type of chemical reaction which occurs.
- Give one example of another reaction which is of the same type as the above reaction.
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Solution
- When aqueous sodium sulphate reacts with aqueous barium chloride, a white, insoluble precipitate of barium sulphate forms, along with a solution of sodium chloride.
- \[\ce{Na2SO4_{(aq)} + BaCl2_{(aq)} -> BaSO4_{(s)} + 2NaCl_{(aq)}}\]
- 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.
- Double displacement reaction
- \[\ce{Pb(NO3)2_{(aq)} + 2KI_{(aq)} -> PbI2_{(s)} + 2KNO3_{(aq)}}\]
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