Acetic acid systematically named
ethanoic acid /ˌɛθəˈnoʊɪk/, is a colourless liquid organic compound with the
chemical formula CH3COOH (also written as CH3CO2H or C2H4O2). When undiluted,
it is sometimes called glacial acetic acid. Vinegar is no less than 4% acetic
acid by volume, making acetic acid the main component of vinegar apart from water.
Acetic acid has a distinctive sour taste and pungent smell. In addition to
household vinegar, it is mainly produced as a precursor to polyvinyl acetate
and cellulose acetate. It is classified as a weak acid since it only partially
dissociates in solution, but concentrated acetic acid is corrosive and can
attack the skin.
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