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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