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CAIE IGCSE Chemistry 7.1.12 Ethanoic acid is a weak acid, as shown

CAIE IGCSE Chemistry 7.1.12 Ethanoic acid is a weak acid, as shown
Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise representing ethanoic acid as a weak acid by completing reversible dissociation equations with H+(aq) and ethanoate ions.

How this is tested

  • complete CH3COOH(aq) ⇌ H+(aq) + CH3COO-(aq) with the reversible arrow
  • identify ethanoic acid as partially ionised from its aqueous dissociation equation

Question 25

[Maximum number: 1]

Which equation represents a solution of ethanoic acid in water?

A

HCOOH(aq)⇌HCOO−(aq)+H+(aq)\mathrm{HCOOH}(\mathrm{aq}) \rightleftharpoons \mathrm{HCOO}^{-}(\mathrm{aq})+\mathrm{H}^{+}(\mathrm{aq})

B

HCOOH(aq)→HCOO−(aq)+H+(aq)\mathrm{HCOOH}(\mathrm{aq}) \rightarrow \mathrm{HCOO}^{-}(\mathrm{aq})+\mathrm{H}^{+}(\mathrm{aq})

C

CH3COOH(aq)⇌CH3COO−(aq)+H+(aq)\mathrm{CH}_{3} \mathrm{COOH}(\mathrm{aq}) \rightleftharpoons \mathrm{CH}_{3} \mathrm{COO}^{-}(\mathrm{aq})+\mathrm{H}^{+}(\mathrm{aq})

D

CH3COOH(aq)→CH3COO−(aq)+H+(aq)\mathrm{CH}_{3} \mathrm{COOH}(\mathrm{aq}) \rightarrow \mathrm{CH}_{3} \mathrm{COO}^{-}(\mathrm{aq})+\mathrm{H}^{+}(\mathrm{aq})