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Properties of substance:

L-proline



skc-file

Group of substances:

organic

Physical appearance:

needles crystals

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

C5H9NO2

Structural formula as text:

C4H8NCOOH

Molar/atomic mass: 115.13

Melting point (°C):

221

Solubility (g/100 g of solvent):

diethyl ether: insoluble [Ref.]
ethanol: 1.96 (19°C) [Ref.]
water: 162 (25°C) [Ref.]

Dissociation:

pKa (1) = 10.64 (25°C, water)

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

-515.2 (s)

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

-366.2 (g)

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-29
  2. Yalkowsky S.H., Yan H., Jain P. Handbook of aqueous solubility data. – 2nd ed. - CRC Press, 2010. - pp. 156
  3. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 898-899 [Russian]
  4. Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 100 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru