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1 markAcids, Bases and Salts

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

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.

State the molecular formula for an acid salt formed from the reaction between phosphoric acid and sodium hydroxide.

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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)(vi)Write a balanced equation to show the formation of the acid salt stated in (a)(v).[2 marks]
  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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