Carboxylic acid

A functional group with the general structure RC(O)–OH.  Loss of a proton (H+) from a carboxylic acid results in its resonance-stabilized conjugate base, called a carboxylate.  Common examples of carboxylic acids are acetic acid (CH3COOH, pKa = 4.7) and benzoic acid (C6H5COOH, pKa = 4.2).

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