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Properties of substance:

calcium sulfate

Group of substances:

inorganic

Physical appearance:

colorless rhombic crystals

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

CaO4S

Structural formula as text:

CaSO4

Molar/atomic mass: 136.14

Melting point (°C):

1420

Decomposition temperature (°C):

1450

Solubility (g/100 g of solvent):

acetic acid: practically insoluble [Ref.]
ethanol: insoluble [Ref.]
ethyl acetate: insoluble [Ref.]
glycerol 97%: 5.16 (15°C) [Ref.]
methanol: insoluble [Ref.]
sulfuric acid: 7.78 (22.2°C) [Ref.]
sulfuric acid: 13.16 (62.2°C) [Ref.]
water: 0.176 (0°C) [Ref.]
water: 0.206 (20°C) [Ref.]
water: 0.212 (30°C) [Ref.]
water: 0.211 (40°C) [Ref.]
water: 0.209 (50°C) [Ref.]
water: 0.167 (100°C) [Ref.]

Multicomponent solubility (in wt%):

water 98,734%, ammonium sulfate 1,12%, calcium sulfate 0,146%, 25 °C, separating phase: CaSO4 * 2H2O [Ref.]
water 94,307%, ammonium sulfate 5,51%, calcium sulfate 0,183%, 25 °C, separating phase: CaSO4 * 2H2O [Ref.]
water 70,967%, ammonium sulfate 28,66%, calcium sulfate 0,373%, 25 °C, separating phase: CaSO4 * 2H2O [Ref.]
water 64,764%, ammonium sulfate 34,85%, calcium sulfate 0,386%, 25 °C, separating phase: CaSO4 * 2H2O + (NH4)2SO4 * CaSO4 * H2O [Ref.]
water 63,02%, ammonium sulfate 36,67%, calcium sulfate 0,31%, 25 °C, separating phase: (NH4)2SO4 * CaSO4 * H2O [Ref.]
water 59,1%, ammonium sulfate 40,7%, calcium sulfate 0,2%, 25 °C, separating phase: (NH4)2SO4 * CaSO4 * H2O [Ref.]
water 94,94%, calcium sulfate 1,5%, hydrochloric acid 3,56%, 25 °C, separating phase: CaSO4 * 2H2O [Ref.]
water 89%, calcium sulfate 1,85%, hydrochloric acid 9,15%, 25 °C, separating phase: CaSO4 * 2H2O [Ref.]
water 74,86%, calcium sulfate 0,88%, hydrochloric acid 24,26%, 25 °C, separating phase: CaSO4 * 2H2O [Ref.]
water 68,75%, calcium sulfate 0,64%, hydrochloric acid 30,61%, 25 °C, separating phase: CaSO4 [Ref.]
water 99,3%, sulfuric acid 0,486%, calcium sulfate 0,214%, 25 °C [Ref.]
water 98,158%, sulfuric acid 1,606%, calcium sulfate 0,236%, 25 °C [Ref.]
water 90,691%, sulfuric acid 9,051%, calcium sulfate 0,258%, 25 °C [Ref.]
water 82,302%, sulfuric acid 17,49%, calcium sulfate 0,208%, 25 °C [Ref.]
water 74,868%, sulfuric acid 25%, calcium sulfate 0,132%, 25 °C [Ref.]
water 94,4426%, sodium chloride 5%, calcium sulfate 0,5574%, 20 °C, separating phase: CaSO4 * 2H2O [Ref.]
water 89,3462%, sodium chloride 10%, calcium sulfate 0,6538%, 20 °C, separating phase: CaSO4 * 2H2O [Ref.]
water 84,3578%, sodium chloride 15%, calcium sulfate 0,6422%, 20 °C, separating phase: CaSO4 * 2H2O [Ref.]
water 79,4101%, sodium chloride 20%, calcium sulfate 0,5899%, 20 °C, separating phase: CaSO4 * 2H2O [Ref.]
water 98,6635%, sodium chloride 1%, calcium sulfate 0,3365%, 20 °C, separating phase: CaSO4 * 2H2O [Ref.]
water 98,44%, nitric acid 1%, calcium sulfate 0,56%, 25 °C [Ref.]
water 94,904%, nitric acid 3,92%, calcium sulfate 1,176%, 25 °C [Ref.]
water 86,88%, nitric acid 11,26%, calcium sulfate 1,86%, 25 °C [Ref.]
water 43,1%, urea 55,8%, calcium sulfate 1,1%, 25 °C, separating phase: (NH2)2CO + CaSO4 * 4(NH2)2CO [Ref.]
water 47,1%, urea 51,5%, calcium sulfate 1,4%, 25 °C, separating phase: CaSO4 * 2H2O + CaSO4 * 4(NH2)2CO [Ref.]

Density:

2.99 (20°C, g/cm3)

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

    -1432.7 (s)

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

    -1320.3 (s)

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

    106.7 (s)

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

    99.6 (s)

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

    28

    References:

    1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 328-344
    2. Будников П.П. Гипс и его исследование. - Л.: Издательство АН СССР, 1933 [Russian]
    3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 72 [Russian]
    4. Рипан Р., Четяну И. Неорганическая химия. - Т.1. - М.: Мир, 1971. - pp. 213 [Russian]
    5. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 249-250 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru