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1 markWater

CAPE Chemistry Unit 2 · 2010 · Paper 2 · Question 3(c)(i)

Suggest a precaution you would take to ensure no external contamination occurs when sampling potable water suspected of containing Pb^2+ and NO3^- ions.

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Other parts of this question

  1. 3(a)(i)Identify two gases present in unpolluted air that contribute to rain water having a pH of 5.6.[2 marks]
  2. 3(a)(ii)Identify a natural source for each of the two gases identified in (a)(i).[2 marks]
  3. 3(a)(iii)Write a balanced chemical equation showing the reaction of one of the gases from (a)(i) with water.[2 marks]
  4. 3(b)(i)Briefly outline two factors responsible for acid rain in industrialized, heavily populated areas.[2 marks]
  5. 3(b)(ii)Suggest two environmental effects of acid rain.[2 marks]
  6. 3(c)(ii)Name one reagent used to confirm contamination by Pb^2+ and one reagent to confirm contamination by NO3^-.[2 marks]
  7. 3(c)(iii)State the expected observations for the tests using the reagents named in (c)(ii) if Pb^2+ and NO3^- are present.[2 marks]

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