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Properties of substance:

RS-2-methylbutanoic acid

Group of substances:

organic

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

C5H10O2

Structural formula as text:

CH3CH2CH(CH3)COOH

Molar/atomic mass: 102.132

Melting point (°C):

-80

Boiling point (°C):

176-177

Dissociation:

pKa (1) = 4.761 (25°C, water)

Retention indices for gas chromatography:

828,2 (phase - 100% dimethylsilicone)
861,9 (phase - dimethylsilicone with 5% phenyl groups)

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

-554.5 (l)

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-29
  2. Свойства органических соединений: Справочник. - Под ред. Потехина А.А. - Л.: Химия, 1984. - pp. 150-151 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru