Making insoluble salts
2 marks · EasyA student wishes to make an insoluble salt of strontium sulfate by mixing two suitable solutions.
Name two solutions the student can mix, and give the balanced chemical equation for the reaction.
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Strontium nitrate and sodium sulfate; \ce{Sr(NO3)2(aq) + Na2SO4(aq) -> SrSO4(s) + 2NaNO3(aq)}
Common mistakes: Incorrect formulae or state symbols
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Marking points
B1 · 1 mark · Names two suitable solutions (e.g. strontium nitrate and sodium sulfate).
B2 · 1 mark · Gives correct balanced equation with all reactants and products, including state symbols.
Worked solution
Suitable solutions: strontium nitrate and sodium sulfate. Balanced equation: