Lactic acid, also known as α-hydroxypropionic acid, or 2-hydroxypropanoic acid, is an organic compound belonging to the family of carboxylic acids with the chemical formula CH3CH(OH)CO2H. It is a white, water-soluble solid or clear liquid that is present in certain plant juices, in the blood and muscles of animals, and in the soil. Lactic acid is classified as an alpha hydroxy acid due to the Lactic acid consists with a hydroxyl group adjacent to the carboxyl group. Lactic acid was discovered by the Swedish chemist Carl Wilhelm Scheele from sour milk for the first time in 1780.
in section "Analytical reagents"