Illustrated Glossary of Organic Chemistry

Carboxylic acid (RCOOH; RCO2H): A molecule containing the carboxyl group. Carboxylic acids are so named after the ease in which the carboxyl group gives up a proton (pKa usually in the range of 0-5).

General carboxylic acid structure. X = a carbon group or a hydrogen atom.

Some Common Carboxylic Acids

Formic acid
Acetic acid
Benzoic acid