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Properties of substance:

cesium fluoride

Synonyms:

caesium fluoride

Group of substances:

inorganic

Physical appearance:

colorless cubic crystals

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

CsF

Structural formula as text:

CsF

Molar/atomic mass: 151.9

Melting point (°C):

684

Boiling point (°C):

1252

Solubility (g/100 g of solvent):

acetone: 0.00077 (18°C) [Ref.]
acetone: 0.00125 (24°C) [Ref.]
acetone: 0.00087 (37°C) [Ref.]
acetonitrile: 0.0048 (25°C) [Ref.]
benzene: insoluble [Ref.]
bromine trifluoride: 23.2 (25°C) [Ref.]
bromine trifluoride: 24.2 (70°C) [Ref.]
cyclohexane: insoluble [Ref.]
diethyl ether: insoluble [Ref.]
dimethylformamide: 0.0097 (24°C) [Ref.]
ethanol: insoluble [Ref.]
hydrazine: soluble [Ref.]
hydrogen fluoride : 0.041 (-25.2°C) [Ref.]
hydrogen fluoride : 0.037 (-7.8°C) [Ref.]
hydrogen fluoride : 199 (10°C) [Ref.]
hydrogen fluoride : 0.043 (11.9°C) [Ref.]
methanol: 191.5 (15°C) [Ref.]
nitrobenzene: insoluble [Ref.]
pyridine: insoluble [Ref.]
tetrahydrofuran: 0.0016 (24°C) [Ref.]
water: 528.9 (0°C) [Ref.]
water: 572.9 (25°C) [Ref.]
water: 599.3 (50°C) [Ref.]

Properties of solutions:

70% (wt.), solvent - water
  Density (g/cm3) = 2.3083 (20°)

Numerical data:

Critical relative humidity (%): 3.7

Density:

3.59 (20°C, g/cm3)

Reactions:

  1. [Ref.1, Ref.2]
    CsF + F2 → Cs[F3]
    CsF + 2F2 → Cs[F5]
  2. Yeild 71%. [Ref.1, Ref.2aster]
    ClOSO2F + CsF → ClF + CsOSO2F

Refractive index (nD):

1.48 (20°C)

Vapour pressure (Torr):

1 (710°C)
10 (844°C)
100 (1025°C)

Dipole moment (D):

7.884

Surface tension (mN/m):

104 (720°C)
102 (750°C)
98 (800°C)
90 (900°C)
83 (980°C)

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

-554 (s)

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

-505.4 (s)

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

93 (s)

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

51.1 (s)

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

21.7

Enthalpy (heat) of vaporization ΔvapH (kJ/mol):

123

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

-361 (g)

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

243.11 (g)

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

35.88 (g)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 458
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 112 [Russian]
  3. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 732-733 [Russian]
  4. Химия и технология редких и рассеянных элементов. - Ч.1. - М.: Высшая школа, 1976. - pp. 100-101 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru