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6 marksNon-Metals

CSEC Chemistry · May/June 2015 · Paper 2 · Question 4(b)

When magnesium ions are present in natural water, it is referred to as 'permanent hard water'.

Describe how permanent hard water is formed. Include balanced chemical equations with state symbols to illustrate this process.

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Other parts of this question

  1. 4(a)(i)Describe ONE method for the preparation of dry calcium carbonate in the laboratory. In your answer, include an equation for the reaction as well as the steps…[5 marks]
  2. 4(a)(ii)The main ingredient in Epsom salts is magnesium sulfate. List ONE use of Epsom salts.[1 mark]
  3. 4(a)(iii)In order to effectively use Epsom salts, it is usually made into a solution. Explain why water molecules are able to dissolve Epsom salts.[3 marks]

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