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Properties of substance:

barium sulfate

Group of substances:

inorganic

Physical appearance:

colorless rhombic crystals

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

BaO4S

Structural formula as text:

BaSO4

Molar/atomic mass: 233.4

Melting point (°C):

1580

Solubility (g/100 g of solvent):

acetic acid: practically insoluble [Ref.]
ethanol: insoluble [Ref.]
ethyl acetate: insoluble [Ref.]
formic acid 95%: 0.0083 (18.5°C) [Ref.]
hydrazine: insoluble [Ref.]
methanol: insoluble [Ref.]
sulfuric acid: 11 (20°C) [Ref.]
water: 0.00022 (18°C) [Ref.]
water: 0.000336 (50°C) [Ref.]
water: 0.00041 (100°C) [Ref.]

Numerical data:

Hardness on the Mohs’ scale: 3.5

Density:

4.5 (20°C, g/cm3)

Dissociation:

pKsp (0) = 9.97 (25°C, water)

Permittivity (dielectric constant):

11.4 (15°C)

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

41

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

-1473.2 (s) [Ref.]

Standard molar Gibbs energy of formation ΔfG (298 K, kJ/mol)

-1362.2 (s) [Ref.]

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

132.2 (s) [Ref.]

Molar heat capacity at constant pressure Cp (298 K, J/(mol·K))

101.8 (s) [Ref.]

References:

  1. Lewis R.J. Sax's Dangerous Properties of Industrial Materials. - 11ed. - Wiley-interscience, 2004. - pp. 345
  2. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 182-186
  3. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 102-103 [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. 55 [Russian]
  6. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 34, 286, 818 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru