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Properties of substance:
cryolite
Synonyms:
sodium hexafluoroaluminate
Group of substances:
inorganic
Physical appearance:
colorless monoclinic crystals
Empirical formula (Hill's system for organic substances):
AlF
6
Na
3
Structural formula as text:
Na3AlF6
Molar/atomic mass: 209.941
Melting point (°C):
1009
Decomposition temperature (°C):
1200
Solubility (g/100 g of solvent):
water
: 0.03481 (0°C) [
Ref.
]
water
: 0.039 (20°C) [
Ref.
]
water
: 0.04177 (25°C) [
Ref.
]
water
: 0.13518 (100°C) [
Ref.
]
Numerical data:
Hardness on the Mohs’ scale: 2.5
Density:
2.9 (20°C, g/cm
3
)
2.62 (1012°C, g/cm
3
)
2.087 (1012°C, g/cm
3
)
Dissociation:
pK
sp
(0) = 9.4 (20°C, water)
Viscosity (mPa·s):
6.7 (1012°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-3312 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
238 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
215.9 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
113
References:
Kirk-Othmer Encyclopedia of chemical technology. - 4ed., Vol. 11. - pp. 142-145
Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 168-169 [Russian]
Лидин Р.А., Андреева Л.Л., Молочко В.А. Константы неорганических веществ. - М.: Дрофа, 2006. - pp. 75 [Russian]
Химическая технология неорганических веществ. - Кн.1, под ред. Ахметова Т.Г. - М.: Высшая школа, 2002. - pp. 304 [Russian]
Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 361 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru