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Properties of substance:

aluminum potassium sulfate


potassium aluminium sulfate; burnt potassium alum;

Physical appearance:

white trigonal crystals

Empirical formula (Hill's system):

AlKO8S2

Structural formula:

KAl(SO4)2

Molar/atomic mass: 258.2

Destruction point (°C):

800-900

Solubility (g/100 g of solvent):

water: 3 (0°C) [Ref.]
water: 5 (15°C) [Ref.]
water: 7.09 (25°C) [Ref.]
water: 8.4 (30°C) [Ref.]
water: 24.8 (60°C) [Ref.]
water: 67 (85°C) [Ref.]
water: 154 (100°C) [Ref.]
ethanol: insoluble [Ref.]

Gigroscopic:

very gigroscopic

Density:

2.75 (20°C, g/cm3)

    Standard molar enthalpy (heat) of formation ΔfH (298 K, kJ/mol)

    -2470,2 (s)

    Standard molar entropy S (298 K, J/(mol·K))

    204,6 (s)

    Enthalpy (heat) of solution ΔsolH (kJ/mol)

    -203,1 (s)

    References:

    1. Milne G.W.A. Gardner's Commercially Important Chemicals. - Wiley-Interscience, 2005. - pp. 23
    2. Лидин Р.А., Молочко В.А., Андреева Л.Л. Химические свойства неорганических веществ. - М.: Химия, 2000. - pp. 85
    3. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 46-47
    4. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 176
    5. Справочник химика. - Т.2. - Л.-М.: Химия, 1964. - pp. 18-19
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru