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Properties of substance:

p-hydroquinone

Group of substances:

organic

Physical appearance:

colorless hexagonal crystals

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

C6H6O2

Structural formula as text:

HOC6H4OH

Molar/atomic mass: 110.1106

Melting point (°C):

170

Boiling point (°C):

286

Solubility (g/100 g of solvent):

acetone: 24.15 (20°C) [Ref.]
benzene: 0.028 (20°C) [Ref.]
benzene: 0.056 (30°C) [Ref.]
benzene: 0.28 (40°C) [Ref.]
benzene: 0.7 (50°C) [Ref.]
carbon tetrachloride: miscible [Ref.]
deuterium oxide: 6.11 (25°C) [Ref.]
diethyl ether: soluble [Ref.]
ethanol: very soluble [Ref.]
formic acid 95%: 6.07 (20.2°C) [Ref.]
hydrogen fluoride : very soluble [Ref.]
water: 3.846 (0°C) [Ref.]
water: 5.9 (15°C) [Ref.]
water: 7.334 (25°C) [Ref.]
water: 11.5 (40°C) [Ref.]
water: 25.93 (60°C) [Ref.]
water: 46.81 (80°C) [Ref.]
water: 66.44 (100°C) [Ref.]

Density:

1.358 (20°C, g/cm3)

    Dissociation:

    pKa (1) = 9.85 (25°C, water)
    pKa (1) = 9.96 (18°C, water)
    pKa (2) = 11.4 (25°C, water)

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

    -363.48 (s)

    Molar enthalpy (heat) of fusion ΔfusH (kJ/mol):

    27.15

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

    99.3

    Heat of combustion (kJ/mol):

    2864.7

    LD50 (mg/kg):

    720 (rats, oral)
    340 (mice, oral)
    299 (dogs, )

    References:

    1. Gangolli S. The Dictionary of Substances and their Effects. - 2 ed., Vol. 4, E-J. - RSC, 1999. - pp. 692-696
    2. Lewis R.J. Sax's Dangerous Properties of Industrial Materials. - 12ed., Vol. 1-5. - Wiley, 2012. - pp. 2439-2440
    3. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 396-400
    4. Yalkowsky S.H., Yan H. Handbook of aqueous solubility data. - CRC Press, 2003. - pp. 258-259
    5. Вредные вещества в промышленности: Справочник для химиков, инженеров и врачей. - 7-е изд., Т.1. - Л.: Химия, 1976. - pp. 423-424 [Russian]
    6. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 140 [Russian]
    7. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 436 [Russian]
    8. Справочник по растворимости. - Т.1, Кн.2. - М.-Л.: ИАН СССР, 1962. - pp. 968, 1274, 1406, 1454 [Russian]
    9. Справочник химика. - 2 изд., Т.1. - Л.-М.: Химия, 1966. - pp. 862-863 [Russian]
    10. Химическая энциклопедия. - Т. 1. - М.: Советская энциклопедия, 1988. - pp. 570 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru