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Properties of substance:

2-butynedioic acid

Group of substances:

organic

Physical appearance:

colorless prismatic crystals

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

C4H2O4

Structural formula as text:

HOOC-CC-COOH

CAS No: 142-45-0

Molar/atomic mass: 114.06

Melting point (°C):

179

Solubility (g/100 g of solvent):

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

    Dissociation:

    pKa (1) = 1.74 (20°C, water)
    pKa (2) = 4.38 (20°C, water)

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

    -577.3 (s)

    References:

    1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-25
    2. Dictionary of organic compounds. - vol.1, Abietic acid - Dypnone. - London, 1946. - pp. 23
    3. Свойства органических соединений: Справочник. - Под ред. Потехина А.А. - Л.: Химия, 1984. - pp. 180-181 [Russian]
    4. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 458-459 [Russian]
    5. Химическая энциклопедия. - Т. 1. - М.: Советская энциклопедия, 1988. - pp. 228 [Russian]
    6. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 62 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru