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In which product would you expect acetic acid rather than lactic acid to predominate?

  • A.Vinegar
  • B.Sauerkraut
  • C.Salt-stock pickles
  • D.Kimchi

Answer: A

Vinegar is made by acetic acid bacteria oxidising ethanol in the presence of air, so acetic acid dominates there. The three fermented vegetables are all lactic fermentations conducted without air, in which acetic acid is a minor product at most.

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