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Properties of substance:

2-propynoic acid

Group of substances:

organic

Physical appearance:

colorless liquid

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

C3H2O2

Structural formula as text:

HCC-COOH

Molar/atomic mass: 70.05

Melting point (°C):

18

Boiling point (°C):

144

Decomposition temperature (°C):

144

Solubility (g/100 g of solvent):

chloroform: very soluble [Ref.]
diethyl ether: soluble [Ref.]
ethanol: soluble [Ref.]
water: soluble [Ref.]

Density:

1.139 (15°C, d15)

Refractive index (nD):

1.4306 (20°C)

Vapour pressure (Torr):

50 (83°C)

    Dissociation:

    pKa (1) = 1.84 (25°C, water)

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

    -193.2 (l)

    References:

    1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-23
    2. Dictionary of organic compounds. - Vol.4: Obaculactone-Zymosterol. - New York, 1953. - pp. 237
    3. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 164
    4. Свойства органических соединений: Справочник. - Под ред. Потехина А.А. - Л.: Химия, 1984. - pp. 336-337 [Russian]
    5. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 387 [Russian]
    6. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 918-919 [Russian]
    7. Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 107 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru