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Properties of substance:

3-aminopropanoic acid

Synonyms:

β-alanine

Group of substances:

organic

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

C3H7NO2

Structural formula as text:

H2NCH2CH2COOH

Molar/atomic mass: 89.093

Melting point (°C):

196

Decomposition temperature (°C):

200

Solubility (g/100 g of solvent):

acetone: insoluble [Ref.]
chloroform: insoluble [Ref.]
diethyl ether: insoluble [Ref.]
ethanol: 0.022 (25°C) [Ref.]
water: 35.28 (25°C) [Ref.]

Density:

1.437 (19°C, g/cm3)

Reactions of synthesis:

  1. Yeild 40-45%. [Ref.1]
    (CH2CO)2NH + KBrO + H2O → NH2CH2CH2COOH + KBr + CO2

Dissociation:

pKa (1) = 10.24 (25°C, water)
pKa (2) = 3.6 (25°C, water)

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

-558 (s)

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

-424 (g)

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 3-10
  2. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-24
  3. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 200
  4. Yalkowsky S.H., Yan H., Jain P. Handbook of aqueous solubility data. – 2nd ed. - CRC Press, 2010. - pp. 70
  5. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 408-409 [Russian]
  6. Справочник химика. - Т. 3. - М.-Л.: Химия, 1965. - pp. 85 [Russian]
  7. Химическая энциклопедия. - Т. 1. - М.: Советская энциклопедия, 1988. - pp. 81-82 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru