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Physical properties of lactic acid

Chemical Abstracts Registration CAS.-Reg.-No. [79-33-4]
Chemical formula C3H6O3
Chemical name (S)-2-hydroxy-propanoic acid
Molecular Weight 90.08
Physical appearance aqueous solution
Taste mild acid taste
Melting point 53oC / 127oF
Boiling point > 200oC / 390oF
Solubility in water (g/100 g H2O) miscible
Dissociation Constant, Ka 1.38 * 10^ -4
pKa 3.86
pH (0.1% solution, 25oC) 2.9
pH (0.1 N solution, 25oC) 2.4

L(+) lactic acid