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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/cm
3
)
Reactions:
[
Ref.1
]
LiF + PF
5
→ LiPF
6
Vapour pressure (Torr):
0.1 (920°C)
1 (1048°C)
10 (1209°C)
100 (1427°C)
Dissociation:
pK
sp
(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 Δ
f
H
0
(298.15 K, kJ/mol):
-612.1 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
-584.1 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
35.9 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
42.01 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
10
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
213
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-339 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
200.2 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
31.29 (g)
LD
50
(mg/kg):
175 (mice, oral)
References:
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 922-923
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 77 [Russian]
Редкие и рассеянные элементы. Химия и технология. - Кн. 1. - М.: Мисис, 1996. - pp. 30 [Russian]
Рысс И.Г. Химия фтора и его неорганических соединений. - М., 1956. - pp. 704 [Russian]
Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 638 [Russian]
Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 112-113 [Russian]
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