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Properties of substance:

DL-lactic acid

Group of substances:

organic

Physical appearance:

colorless liquid

Empirical formula (Hill's system for organic substances):

C3H6O3

Structural formula as text:

CH3CH(OH)COOH

Molar/atomic mass: 90.078

Melting point (°C):

18

Solubility (g/100 g of solvent):

diethyl ether: sparingly soluble [Ref.]
ethanol: very soluble [Ref.]
water: 89 (0°C) [Ref.]
water: 105 (10°C) [Ref.]
water: 126 (20°C) [Ref.]
water: 150 (30°C) [Ref.]
water: 180 (40°C) [Ref.]
water: 270 (60°C) [Ref.]
water: 460 (80°C) [Ref.]

Hygroscopic:

yes

Numerical data:

Year of discovery: 1780

Density:

1.249 (15°C, g/cm3)
1.206 (25°C, g/cm3)

Reactions:

  1. Yeild 65%. [Ref.1]
    CH3CH(OH)COOH + CH3OH → CH3CH(OH)COOCH3 + H2O

Refractive index (nD):

1.4392 (20°C)

Vapour pressure (Torr):

15 (122°C)

Dissociation:

pKa (1) = 3.862 (25°C, water)

Permittivity (dielectric constant):

22 (17°C)

Heat of combustion (kJ/mol):

1364

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 3-336
  2. Досон Р., Эллиот Д., Эллиот У., Джонс К. Справочник биохимика. - М.: Мир, 1991. - pp. 47 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 162 [Russian]
  4. Свойства органических соединений: Справочник. - Под ред. Потехина А.А. - Л.: Химия, 1984. - pp. 312-313 [Russian]
  5. Смирнов В.А. Пищевые кислоты. - М.: Легкая и пищевая промышленность, 1983. - pp. 27-29, 42-43 [Russian]
  6. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 798-799 [Russian]
  7. Хёрд Ч.Д. Пиролиз соединений углерода. - Л.-М.: ГОНТИ РКТП СССР, 1938. - pp. 414-415 [Russian]
  8. Химическая энциклопедия. - Т. 3. - М.: Советская энциклопедия, 1992. - pp. 130-131 [Russian]
  9. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 351 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru