Name: Lactic acid

English name: 2-Hydroxypropanoic acid (lactic acid)

Also called: α-hydroxypropionic acid; propanoic acid

Chemical formula: C3H6O3

Molecular weight: 90.08 g·mol−1

CAS registration number: 50-21-5, 79-33-4 (L), 10326-41-7 (D)

Melting point: L: 53 °C, D: 53 °C, D/L: 16.8 °C

Boiling point: 122 °C (12 mmHg)

Water solubility: it can be mixed with water, ethanol or ether at will, insoluble in chloroform (aqueous solution shows acid reaction)

Closeness: 1.209

Exterior view: colorless, clear or slightly yellow viscous liquid; almost odorless, slightly acidic in taste; hygroscopic

Flash point: greater than 110°C

use

1. Lactic acid has a strong antiseptic and fresh-keeping effect. To

2. It is widely used as preservative, carrier, cosolvent, pharmaceutical preparation, pH regulator, etc. in medicine.