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Chemistry · May / June 2018 · Paper 11 · Question 23

5070Preparation of salts

Pure lead(II) sulfate is prepared by mixing two substances, X and Y. When the reaction is complete the mixture is filtered. Pure lead(II) sulfate is obtained. [diagram of filtration apparatus with labels residue and filtrate] Which row shows the best way to prepare pure lead(II) sulfate?

  1. Asubstance X: aqueous lead(II) nitrate; substance Y: aqueous sodium sulfate; method after filtration: crystallise the filtrate
  2. Bsubstance X: aqueous lead(II) nitrate; substance Y: aqueous sodium sulfate; method after filtration: wash and dry the residue
  3. Csubstance X: solid lead(II) carbonate; substance Y: dilute sulfuric acid; method after filtration: crystallise the filtrate
  4. Dsubstance X: solid lead(II) carbonate; substance Y: dilute sulfuric acid; method after filtration: wash and dry the residue

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Correct answer: B. substance X: aqueous lead(II) nitrate; substance Y: aqueous sodium sulfate; method after filtration: wash and dry the residue

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