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Properties of substance:

calcium carbonate

Synonyms:

calcite

Group of substances:

inorganic

Physical appearance:

colorless trigonal crystals

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

CCaO3

Structural formula as text:

CaCO3

Molar/atomic mass: 100.09

Solubility (g/100 g of solvent):

ethyl acetate: insoluble [Ref.]
water: 0.001437 (25°C) [Ref.]
water: 0.001522 (50°C) [Ref.]
water: 0.001856 (100°C) [Ref.]

Multicomponent solubility (in wt%):

water 99.694%, calcite 0.098%, carbon dioxide 0.208%, 25 °C, separating phase: CaCO3 (давление CO2 = 1,06 атм, в растворе Ca(HCO3)2) [Ref.]
water 99.3015%, ammonium chloride 0.67%, calcite 0.0285%, 25 °C [Ref.]
water 98.6227%, ammonium chloride 1.34%, calcite 0.0373%, 25 °C [Ref.]
water 97.2698%, ammonium chloride 2.68%, calcite 0.0502%, 25 °C [Ref.]
water 94.5822%, ammonium chloride 5.35%, calcite 0.0678%, 25 °C [Ref.]
water 84.282%, ammonium chloride 15.6%, calcite 0.118%, 60 °C, separating phase: CaCO3 [Ref.]

Numerical data:

Vickers hardness (GPa): 1.03

Density:

2.71 (25°C, g/cm3)

    Dissociation:

    pKsp (0) = 7.92 (25°C, water)

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

    -1206.9 (s)

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

    -1128.8 (s)

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

    92.9 (s)

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

    81.88 (s)

    References:

    1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 264-276
    2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 71 [Russian]
    3. Спицын В.И., Мартыненко Л.И. Неорганическая химия. - Ч.2. - М.: ИМУ, 1994. - pp. 44-45 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru