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Properties of substance:

calcium sulfate dihydrate

Group of substances:

inorganic

Physical appearance:

colorless monoclinic crystals

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

H4CaO6S

Structural formula as text:

CaSO4 * 2H2O

Molar/atomic mass: 172.17

Decomposition temperature (°C):

128

Solubility (g/100 g of solvent):

glycerol: soluble [Ref.]
water: 0.176 (0°C) [Ref.]
water: 0.193 (10°C) [Ref.]
water: 0.206 (20°C) [Ref.]
water: 0.209 (25°C) [Ref.]
water: 0.212 (30°C) [Ref.]

Numerical data:

Thermal conductivity (W/m·K): 1.297

Density:

2.32 (20°C, g/cm3)

    Dissociation:

    pKsp (0) = 5 (20°C, water)

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

    -2021.1 (s)

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

    -1795.7 (s)

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

    193.97 (s)

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

    186.2 (s)

    References:

    1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-56
    2. Comey A. M., Hahn D. A. A dictionary of Chemical Solubilities Inorganic. - 2 ed. - New York, The MacMillan Company, 1921. - pp. 944-954
    3. Будников П.П. Гипс и его исследование. - Л.: Издательство АН СССР, 1933 [Russian]
    4. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 176 [Russian]
    5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 72 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru