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4.2 Reactions of acids

4.2 Reactions of acids

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Question 2

Propanoic acid is a weak carboxylic acid often used as a preservative in animal feed.

The chemical formula of propanoic acid is C3H6O2\text{C}_3\text{H}_6\text{O}_2C3​H6​O2​.

a.

Which ion is produced by propanoic acid molecules when they partially ionise in an aqueous solution?

  • OH−\text{OH}^-OH−
  • O2−\text{O}^{2-}O2−
  • H+\text{H}^+H+
[1]
b.

Calculate the relative formula mass (MrM_rMr​) of propanoic acid (C3H6O2\text{C}_3\text{H}_6\text{O}_2C3​H6​O2​).

Relative atomic masses (ArA_rAr​): H=1\text{H} = 1H=1, C=12\text{C} = 12C=12, O=16\text{O} = 16O=16.

[2]
Markscheme

4.2 Reactions of acids Questions

  1. GCSE
  2. /Chemistry
  3. /4.2 Reactions of acids

40 exam-style questions on AQA GCSE Chemistry 4.2 Reactions of acids, covering 4.2.1 Reactions of acids with metals, 4.2.2 Neutralisation of acids and salt production, 4.2.3 Soluble salts, 4.2.4 The pH scale and neutralisation, 4.2.5 Titrations, and 4.2.6 Strong and weak acids (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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