Carboxylic acid molecules all contain a carboxyl group, so they react with bases.
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Built on 羧 'carboxyl', a chemistry coinage, and also called 有机酸 'organic acid'. The short-chain ones are named with the Heavenly Stems by carbon count: 甲酸 formic, 乙酸 acetic, 丙酸 propionic, 丁酸 butyric.
