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souring

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souring

Change that occurs to wine on prolonged exposure to air. The ethanol in the wine is oxidized by the air (oxygen) to ethanoic acid. It is the presence of the ethanoic (acetic) acid that produces the sour taste:

CH3CH2OH(aq) + O2(g) → CH3COOH(aq) + H2O(1)

Milk turns sour with the production of lactic acid, brought about by bacterial action.



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? Mentioned in ? References in classic literature
 
This ill-luck had given a gentle melancholy to his countenance, but instead of souring his nature had sweetened it, so that he was quite the humblest of the boys.
The Adventures of Peter Pan by Barrie, James Matthew View in context
A sour wine, moreover, or a souring, for its influence on the mood of those who drank it was to make them gloomy.
A Tale Of Two Cities by Dickens, Charles View in context
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