Specification Point 4.37C (Paper 2C Only):
Know that vinegar is an aqueous solution containing ethanoic acid


Vinegar: an aqueous solution containing ethanoic acid.

Vinegar, Edexcel IGCSE Chemistry

Diagram showing an atom of ethanoic acid

Formation of vinegar (Ethanoic acid):

  • The microbial oxidation of ethanol will produce a weak solution of vinegar (ethanoic acid).
  • This occurs when a bottle of wine is opened as bacteria in the air (acetobacter) will use atmospheric oxygen from air to oxidise the ethanol in the wine.

 Ethanol    +    Oxygen    →    Ethanoic Acid    +    Water

 C2H5OH              3O2                    CH3COOH              3H2O

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Author: Jamie

Jamie got a First class degree in Chemistry from Oxford University before going on to teach chemistry full time as a professional tutor. He’s put together these handy revision notes to match the Edexcel IGCSE Chemistry specification so you can learn exactly what you need to know for your exams.