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2 marksWater

CAPE Chemistry Unit 2 · May/June 2019 · Paper 2 · Question 3(c)(ii)

A student collected samples of water from a garbage dump and carried out several tests to identify the pollutants present in the water samples.

Describe laboratory tests which would confirm the presence of CN-.

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Other parts of this question

  1. 3(a)(i)Identify EACH of the following components in Figure 6: A, B, C, D, E.[3 marks]
  2. 3(a)(ii)Write the formulae of the substances in the mixture F in Figure 6.[3 marks]
  3. 3(a)(iii)Write an equation to represent the reaction at EACH electrode during the production of aluminium.[2 marks]
  4. 3(a)(iv)Suggest THREE factors which may influence the location of a bauxite plant.[3 marks]
  5. 3(b)(i)Starting with sulfur, list the THREE main processes which occur during the production of sulfuric acid.[3 marks]
  6. 3(b)(ii)Using an appropriate equation, apply the principles of chemical equilibrium to deduce the theoretical conditions for the formation of sulfur trioxide.[5 marks]
  7. 3(b)(iii)Discuss the actual conditions used in the formation of sulfur trioxide in the contact process. Your response should include conditions of temperature,…[5 marks]
  8. 3(b)(iv)State ONE impact of the sulfuric acid industry on the environment.[1 mark]
  9. 3(c)(i)Describe laboratory tests which would confirm the presence of PO4^3-.[3 marks]

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