The carboxyl hydrogen atom of acetic acid can be partially ionized into hydrogen ions (protons) and released, resulting in the acidity of carboxylic acid. Acetic acid is a weak monobasic acid in aqueous solution. The acidity coefficient is 4.8, pka=4.75 (25 ºC), and the pH of 1mol/l acetic acid solution (similar to the concentration of household vinegar) is 2.4, that is, only 0.4% of acetic acid molecules are dissociated.
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