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2 marksNon-Metals

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

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

Write a balanced equation showing how hard water, formed as stated above, can be softened using sodium carbonate.

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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)(ii)Name and describe ONE other method by which water can be softened.[4 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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