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Properties of substance:

rubidium sulfate

Synonyms:

rubidium sulphate

Group of substances:

inorganic

Physical appearance:

colorless rhombic crystals

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

O4Rb2S

Structural formula as text:

Rb2SO4

Molar/atomic mass: 266.99

Melting point (°C):

1074

Boiling point (°C):

1700

Solubility (g/100 g of solvent):

ethanol: sparingly soluble [Ref.]
sulfuric acid: 31.96 (20°C) [Ref.]
water: 36.4 (0°C) [Ref.]
water: 42.6 (10°C) [Ref.]
water: 48.2 (20°C) [Ref.]
water: 53.5 (30°C) [Ref.]
water: 58.5 (40°C) [Ref.]
water: 63.1 (50°C) [Ref.]
water: 67.4 (60°C) [Ref.]
water: 75 (80°C) [Ref.]
water: 81.8 (100°C) [Ref.]

Density:

3.61 (20°C, g/cm3)

Surface tension (mN/m):

130.5 (1100°C)
123.5 (1200°C)
117.7 (1300°C)

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

-1437.1 (s)

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

197.5 (s)

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

134 (s)

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

38.4

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1440
  2. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 184-185 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 94 [Russian]
  4. Редкие и рассеянные элементы. Химия и технология. - Кн. 1. - М.: Мисис, 1996. - pp. 74-75 [Russian]
  5. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 191, 715 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru