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Properties of substance:

L-alanine

Synonyms:

(S)-2-aminopropanoic acid

Group of substances:

organic

Physical appearance:

rhombic 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):

297

Decomposition temperature (°C):

297

Solubility (g/100 g of solvent):

acetone: insoluble [Ref.]
diethyl ether: insoluble [Ref.]
ethanol: 0.16 (20°C) [Ref.]
water: 16.65 (25°C) [Ref.]
water: 32.2 (75°C) [Ref.]

Density:

1.432 (23°C, g/cm3)

    Dissociation:

    pKBH+ (1) = 2.34 (25°C, water)
    pKa (1) = 9.69 (25°C, water)

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

    -604 (s)

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

    -465.9 (g)

    References:

    1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-24
    2. Milne G.W.A. Gardner's Commercially Important Chemicals. - Wiley-Interscience, 2005. - pp. 15
    3. Yalkowsky S.H., Yan H., Jain P. Handbook of aqueous solubility data. – 2nd ed. - CRC Press, 2010. - pp. 69-70
    4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 121 [Russian]
    5. Тюкавкина Н.А., Бауков Ю.И. Биоорганическая химия. - М.: Медицина, 1985. - pp. 299 [Russian]
    6. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советсткая энциклопедия, 1983. - pp. 21 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru