Carboxylic acids (R–CO2H) contain the carboxyl group CO2H

As their name implies, compounds containing the carboxylic acid (CO2H) group can react with bases,
losing a proton to form carboxylate salts. Edible carboxylic acids have sharp flavours and several are
found in fruits—citric, malic, and tartaric acids are found in lemons, apples, and grapes, respectively.