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Properties of substance:

4-aminobutanoic acid

Synonyms:

γ-aminobutyric acid

Group of substances:

organic

Physical appearance:

colorless needles crystals

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

C4H9NO2

Structural formula as text:

NH2CH2CH2CH2COOH

Molar/atomic mass: 103.12031

Melting point (°C):

203

Decomposition temperature (°C):

203

Solubility (g/100 g of solvent):

acetone: sparingly soluble [Ref.]
benzene: insoluble [Ref.]
diethyl ether: insoluble [Ref.]
ethanol: sparingly soluble [Ref.]
ligroin: sparingly soluble [Ref.]
water: 130 (25°C) [Ref.]

Dissociation:

pKBH+ (1) = 4.031 (25°C, water)
pKa (1) = 10.56 (25°C, water)

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

-581 (s)

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

-441 (g)

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 3-16, 5-27
  2. The Merck Index 11th ed., Merck & Company, 1989. - pp. 70
  3. Yalkowsky S.H., Yan H., Jain P. Handbook of aqueous solubility data. – 2nd ed. - CRC Press, 2010. - pp. 121
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 123 [Russian]
  5. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 404 [Russian]
  6. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 770-771 [Russian]
  7. Хёрд Ч.Д. Пиролиз соединений углерода. - Л.-М.: ГОНТИ РКТП СССР, 1938. - pp. 460 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru