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Properties of substance:

DL-alanine

Synonyms:

DL-2-aminopropanoic acid

Group of substances:

organic

Physical appearance:

needles crystals

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

C3H7NO2

Structural formula as text:

H2NCH(CH3)COOH

Molar/atomic mass: 89.093

Melting point (°C):

295

Solubility (g/100 g of solvent):

acetone: insoluble [Ref.]
diethyl ether: insoluble [Ref.]
ethanol 50%: 1.16 (0°C) [Ref.]
ethanol 50%: 2.52 (25°C) [Ref.]
ethanol 50%: 4.25 (45°C) [Ref.]
ethanol 50%: 6.68 (60°C) [Ref.]
ethanol 75%: 0.305 (0°C) [Ref.]
ethanol 75%: 0.573 (25°C) [Ref.]
ethanol 75%: 0.949 (45°C) [Ref.]
ethanol 75%: 1.48 (60°C) [Ref.]
ethanol 90%: 0.1 (25°C) [Ref.]
ethanol 95%: 0.0167 (0°C) [Ref.]
ethanol 95%: 0.0329 (25°C) [Ref.]
ethanol 95%: 0.0545 (45°C) [Ref.]
ethanol 95%: 0.0851 (60°C) [Ref.]
pyridine: soluble [Ref.]
water: 16.6 (25°C) [Ref.]
water: 32.2 (75°C) [Ref.]

Numerical data:

Sweetness potency сompared with a 8% (w/v) aqueous solution of sucrose: 0.94

Density:

1.424 (25°C, g/cm3)

Dissociation:

pKa (1) = 9.87 (25°C, water)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-563.6 (s)

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-24
  2. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 198-200
  3. Yalkowsky S.H., Yan H., Jain P. Handbook of aqueous solubility data. – 2nd ed. - CRC Press, 2010. - pp. 71
  4. Губен И. Методы органической химии. - Т. 4, Вып. 2. - М.-Л.: ГНТИХЛ, 1949. - pp. 910 [Russian]
  5. Досон Р., Эллиот Д., Эллиот У., Джонс К. Справочник биохимика. - М.: Мир, 1991. - pp. 13 [Russian]
  6. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 121 [Russian]
  7. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 391 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru