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Properties of substance:

lithium fluoride

Group of substances:

inorganic

Physical appearance:

colorless cubic crystals

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

FLi

Structural formula as text:

LiF

Molar/atomic mass: 25.94

Melting point (°C):

870

Boiling point (°C):

1681

Solubility (g/100 g of solvent):

acetone: 0.00000033 (18°C) [Ref.]
acetone: 0.0000004 (37°C) [Ref.]
acetonitrile: 0.000296 (24°C) [Ref.]
benzene: 0.000033 (25°C) [Ref.]
bromine trifluoride: 0.125 (25°C) [Ref.]
bromine trifluoride: 0.081 (70°C) [Ref.]
cyclohexane: insoluble [Ref.]
dimethylformamide: 0.00028 (24°C) [Ref.]
ethanol: insoluble [Ref.]
ethyl acetate: difficulty soluble [Ref.]
hydrogen fluoride : 10.3 (-23°C) [Ref.]
hydrogen fluoride : 10.3 (-3.3°C) [Ref.]
hydrogen fluoride : 10.3 (12.2°C) [Ref.]
propylene carbonate: insoluble [Ref.]
sulfur dioxide: 0.06 (0°C) [Ref.]
tetrahydrofuran: 0.00026 (24°C) [Ref.]
water: 0.12 (0°C) [Ref.]
water: 0.13 (25°C) [Ref.]
water: 0.135 (35°C) [Ref.]

Numerical data:

Vickers hardness (GPa): 1.5

Density:

2.635 (20°C, g/cm3)

Reactions:

  1. [Ref.1]
    LiF + PF5 → LiPF6

Vapour pressure (Torr):

0.1 (920°C)
1 (1048°C)
10 (1209°C)
100 (1427°C)

Dissociation:

pKsp (0) = 2.42 (20°C, water)

Surface tension (mN/m):

231 (900°C)
221 (1000°C)
211 (1100°C)
201 (1200°C)

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

-612.1 (s)

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

-584.1 (s)

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

35.9 (s)

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

42.01 (s)

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

10

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

213

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

-339 (g)

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

200.2 (g)

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

31.29 (g)

LD50 (mg/kg):

175 (mice, oral)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 922-923
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 77 [Russian]
  3. Редкие и рассеянные элементы. Химия и технология. - Кн. 1. - М.: Мисис, 1996. - pp. 30 [Russian]
  4. Рысс И.Г. Химия фтора и его неорганических соединений. - М., 1956. - pp. 704 [Russian]
  5. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 638 [Russian]
  6. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 112-113 [Russian]
  7. Химия и технология редких и рассеянных элементов. - Ч.1. - М.: Высшая школа, 1976. - pp. 18-19 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru