ethanoic acid

Acetic acid, CH3COOH, also  known as ethanoic acid, is an
organic  acid  that  gives  vinegar its  sour  taste  and
pungent smell.  It is a weak  acid, in that it  is only a
partially dissociated acid in an aqueous solution.

http://en.wikipedia.org/wiki/Acetic_acid
 

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