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Properties of substance:

pyridine



skc-file

Group of substances:

organic

Physical appearance:

colorless liquid

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

C5H5N

Molar/atomic mass: 79.11

Melting point (°C):

-41.8

Boiling point (°C):

115.3

Solubility (g/100 g of solvent):

acetone: soluble [Ref.]
ammonia liquid : miscible [Ref.]
benzene: soluble [Ref.]
chloroform: soluble [Ref.]
diethyl ether: miscible [Ref.]
ethanol: miscible [Ref.]
hydrogen fluoride : very soluble [Ref.]
iodine monochloride: soluble [Ref.]
sulfolane: miscible [Ref.]
water: miscible [Ref.]

Density:

0.9819 (20°C, g/cm3)

Refractive index (nD):

1.5095 (20°C)

Vapour pressure (Torr):

10 (13.2°C)
100 (57.8°C)
200 (75°C)
600 (95.6°C)

    Dissociation:

    pKBH+ (1) = 5.23 (25°C, water)
    pKBH+ (1) = 4.48 (20°C, formamide)

    Retention indices for gas chromatography:

    739,1 (phase - DB-5, temperature-programmed conditions, 6 K/min)
    738 (phase - OV-101, 110°C)

    Permittivity (dielectric constant):

    12.3 (25°C)

    Dipole moment (D):

    2.19 (20°C)

    Viscosity (mPa·s):

    0.974 (20°C)

    Surface tension (mN/m):

    38 (20°C)

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

    100.2 (l)

    Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

    132.7 (l)

    Enthalpy (heat) of vaporization ΔvapH (kJ/mol):

    35.54

    Heat of combustion (kJ/mol):

    2868.1

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

    140.4 (g)

    Critical temperature (°C):

    346.8

    Critical pressure (MPa):

    5.63

    References:

    1. Dictionary of organic compounds. - Vol. 3, naphthacarbazole - zygadenine. - М.: ИИЛ, 1949. - pp. 552-553
    2. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 286-290
    3. Вредные вещества в промышленности: Справочник для химиков, инженеров и врачей. - 7-е изд., Т.2. - Л.: Химия, 1976. - pp. 444 [Russian]
    4. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 556 [Russian]
    5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 173, 225 [Russian]
    6. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 411-412 [Russian]
    7. Химия: справочное руководство. - Под ред. Гаврюченкова Ф.Г., Курочкиной М.И. и др. - Л.: Химия, 1975. - pp. 372-375 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru