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2 marksMole Concept

CSEC Chemistry · January 2018 · Paper 2 · Question 2(a)(vi)

Phosphoric acid, H₃PO₄, is a common additive in most soft drinks. It can react with sodium hydroxide, an alkali, to form both normal and acid salts.

Write a balanced equation to show the formation of the acid salt stated in (a)(v).

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Other parts of this question

  1. 2(a)(i)Define the terms 'acid' and 'alkali'.[1 mark]
  2. 2(a)(ii)Define the terms 'acid salts' and 'normal salts'.[1 mark]
  3. 2(a)(iii)State the molecular formula for the normal salt formed from the reaction between phosphoric acid and sodium hydroxide.[1 mark]
  4. 2(a)(iv)Write a balanced equation to show the formation of the normal salt stated in (a)(iii).[2 marks]
  5. 2(a)(v)State the molecular formula for an acid salt formed from the reaction between phosphoric acid and sodium hydroxide.[1 mark]
  6. 2(b)Which of the two acids is stronger?[1 mark]
  7. 2(c)(i)Name TWO acids present in orange juice.[2 marks]
  8. 2(c)(ii)State the type of chemical reaction that takes place in the treatment of excess stomach acid.[1 mark]
  9. 2(c)(iii)Hence, name ONE substance that can be used to treat excess stomach acid.[1 mark]

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