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2 marksWater

CAPE Chemistry Unit 2 · 2013 · Paper 2 · Question 3(c)(iii)

Explain why dissolved oxygen must be removed from water prior to use in industrial boilers and pipelines.

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Other parts of this question

  1. 3(a)(i)State the process that may have led to the transport of pollutants into the stream.[1 mark]
  2. 3(a)(ii)Identify two sources of pollutants (other than fertilizers) most likely present in the stream.[2 marks]
  3. 3(b)(i)Describe a laboratory test to identify the presence of nitrates, stating the reagents used and the expected observations.[2 marks]
  4. 3(b)(ii)Describe a laboratory test to identify the presence of phosphates, stating the reagents used and the expected observations.[2 marks]
  5. 3(c)(i)State two ways by which dissolved oxygen enters natural waterways.[2 marks]
  6. 3(c)(ii)Explain how the process of eutrophication causes a decline in water quality.[2 marks]
  7. 3(d)State two main steps involved in municipal water treatment to produce potable water.[2 marks]

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