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4 marksNon-Metals

CSEC Chemistry · January 2017 · Paper 2 · Question 6(b)(ii)

Water becomes hard when it passes over calcium carbonate rocks, but it can be softened by various methods.

Name and describe ONE other method by which water can be softened.

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Other parts of this question

  1. 6(a)State TWO properties of water and explain how EACH property assists in sustaining life on Earth.[4 marks]
  2. 6(b)(i)Write a balanced equation showing how hard water, formed as stated above, can be softened using sodium carbonate.[2 marks]
  3. 6(c)Describe a method which can be used to distinguish between hard water and soft water using soap.[5 marks]

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