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Properties of substance:

iron(II) hydroxide

Group of substances:

inorganic

Physical appearance:

trigonal crystals

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

H2FeO2

Structural formula as text:

Fe(OH)2

Molar/atomic mass: 89.86

Decomposition temperature (°C):

150

Solubility (g/100 g of solvent):

water: 0.0000732 (25°C) [Ref.]

Density:

3.4 (20°C, g/cm3)

    Electrode potential:

    Fe(OH)3 + H+ + e- → Fe(OH)2 + H2O, E = 0.271 V (water, 25°C)

    Dissociation:

    pKb (2) = 3.89 (25°C, water)
    pKsp (0) = 15 (20°C, water)

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

    -561.7 (s)

    Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

    -479.7 (s)

    Standard molar entropy S0 (298.15 K, J/(mol·K)):

    88 (s)

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

    97.1 (s)

    References:

    1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 535
    2. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 409 [Russian]
    3. Неорганическая химия. – Под ред. Третьякова Ю.Д., Т.3, Кн.2. - М.: Академия, 2007. - pp. 58-59 [Russian]
    4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 62 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru