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Properties of substance:
potassium fluoride
Group of substances:
inorganic
Physical appearance:
colorless cubic crystals
Empirical formula (Hill's system for organic substances):
FK
Structural formula as text:
KF
Molar/atomic mass: 58.1
Melting point (°C):
857
Boiling point (°C):
1500
Solubility (g/100 g of solvent):
1-propanol
: 0.34 (20°C) [
Ref.
]
N-methylformamide
: 3.58 (25°C) [
Ref.
]
acetone
: 0.000022 (18°C) [
Ref.
]
acetone
: 0.00025 (24°C) [
Ref.
]
acetonitrile
: 0.0036 (18°C) [
Ref.
]
acetonitrile
: 0.00023 (24°C) [
Ref.
]
acetonitrile
: 0.0004 (25°C) [
Ref.
]
acetonitrile
: 0.0024 (25°C) [
Ref.
]
ammonia liquid
: insoluble [
Ref.
]
antimony trichloride
: very soluble [
Ref.
]
benzene
: 0.000017 (24°C) [
Ref.
]
bromine trifluoride
: 4.96 (25°C) [
Ref.
]
bromine trifluoride
: 5.69 (70°C) [
Ref.
]
cyclohexane
: insoluble [
Ref.
]
dimethylformamide
: 0.0021 (25°C) [
Ref.
]
dimethylsulfoxide
: 0.008 (25°C) [
Ref.
]
dimethylsulfoxide
: 0.0023 (25°C) [
Ref.
]
ethanol
: 0.106 (20°C) [
Ref.
]
ethanol
: 0.096 (30°C) [
Ref.
]
ethanol abs.
: 0.11 (25°C) [
Ref.
]
formamide
: 5.05 (25°C) [
Ref.
]
hydrogen fluoride
: 36.46 (8°C) [
Ref.
]
methanol
: 0.192 (20°C) [
Ref.
]
methanol
: 0.092 (55°C) [
Ref.
]
methyl acetate
: insoluble [
Ref.
]
phosphorus(V) trichloride oxide
: 0.024 (20°C) [
Ref.
]
propylene carbonate
: 0.000988 (25°C) [
Ref.
]
propylene carbonate
: 0.00162 (30°C) [
Ref.
]
propylene carbonate
: 0.00166 (35°C) [
Ref.
]
propylene carbonate
: 0.00084 (40°C) [
Ref.
]
propylene carbonate
: 0.0016 (45°C) [
Ref.
]
sulfur dioxide
: 0.018 (0°C) [
Ref.
]
tetrahydrofuran
: 0.00085 (24°C) [
Ref.
]
water
: 44.7 (0°C) [
Ref.
]
water
: 53.5 (10°C) [
Ref.
]
water
: 92.3 (18°C) [
Ref.
]
water
: 94.9 (20°C) [
Ref.
]
water
: 108 (30°C) [
Ref.
]
water
: 142 (60°C) [
Ref.
]
water
: 150 (90°C) [
Ref.
]
water
: 148.94 (100°C) [
Ref.
]
Multicomponent solubility (in wt%):
water 97.18%, ferric fluoride 2.3%, potassium fluoride 0.52%, 25 °C, separating phase: FeF3 * 3H2O + FeF3 * 2KF * H2O [
Ref.
]
water 98.43%, ferric fluoride 1.01%, potassium fluoride 0.56%, 25 °C, separating phase: FeF3 * 2KF * H2O [
Ref.
]
water 97.594%, ferric fluoride 0.006%, potassium fluoride 2.4%, 25 °C, separating phase: 4FeF3 * 11KF * 12H2O [
Ref.
]
water 96.808%, ferric fluoride 0.002%, potassium fluoride 3.19%, 25 °C, separating phase: 4FeF3 * 11KF * 12H2O [
Ref.
]
water 33.2%, IPA 65.8%, potassium fluoride 1.%, 25 °C [
Ref.
]
water 75.6%, IPA 15.1%, potassium fluoride 9.3%, 25 °C [
Ref.
]
water 53.09%, IPA 0.16%, potassium fluoride 46.75%, 25 °C [
Ref.
]
Hygroscopic:
yes
Density:
2.5 (20°C, g/cm
3
)
Reactions:
Yeild 82%. [
Ref.1
]
O
2
NC
6
H
4
Cl + KF → O
2
NC
6
H
4
F + KCl
Yeild 58%. [
Ref.1
]
O
2
NC
6
H
4
Cl + KF → O
2
NC
6
H
4
F + KCl
Dipole moment (D):
7.33 (20°C)
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
172.8
Standard molar enthalpy (heat) of formation Δ
f
H (298 K, kJ/mol)
-567.3 (s) [
Ref.
]
Standard molar Gibbs energy of formation Δ
f
G (298 K, kJ/mol)
-537.8 (s) [
Ref.
]
Standard molar entropy S (298 K, J/(mol·K))
66.6 (s) [
Ref.
]
Molar heat capacity at constant pressure C
p
(298 K, J/(mol·K))
49 (s) [
Ref.
]
Enthalpy (heat) of fusion Δ
fus
H (kJ/mol)
27.2 (s) [
Ref.
]
LD
50
(mg/kg):
245 (rats, oral)
References:
Comey A. M., Hahn D. A. A dictionary of Chemical Solubilities Inorganic. - 2 ed. - New York, The MacMillan Company, 1921. - pp. 760
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 804-808
Алабышев А.Ф., Грачев К.Я., Зарецкий С.А., Лантратов М.Ф. Натрий и калий (получение, свойства и применение). - Л.: ГНТИХЛ, 1959. - pp. 278-279 [Russian]
Вредные химические вещества: Неорганические соединения элементов I-IV групп. Справочник. - Л.: Химия, 1988. - pp. 47 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 70 [Russian]
Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 678-679, 738-739 [Russian]
Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 88-89 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru