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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):

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.]
propanol: 0.34 (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/cm3)

Reactions:

  1. Yeild 82%. [Ref.1]
    O2NC6H4Cl + KF → O2NC6H4F + KCl
  2. Yeild 58%. [Ref.1]
    O2NC6H4Cl + KF → O2NC6H4F + KCl

Dipole moment (D):

7.33 (20°C)

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

172.8

Standard molar enthalpy (heat) of formation ΔfH (298 K, kJ/mol)

-567.3 (s) [Ref.]

Standard molar Gibbs energy of formation ΔfG (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 Cp (298 K, J/(mol·K))

49 (s) [Ref.]

Enthalpy (heat) of fusion ΔfusH (kJ/mol)

27.2 (s) [Ref.]

LD50 (mg/kg):

245 (rats, oral)

References:

  1. Comey A. M., Hahn D. A. A dictionary of Chemical Solubilities Inorganic. - 2 ed. - New York, The MacMillan Company, 1921. - pp. 760
  2. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 804-808
  3. 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]
  4. Вредные химические вещества: Неорганические соединения элементов I-IV групп. Справочник. - Л.: Химия, 1988. - pp. 47 [Russian]
  5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 70 [Russian]
  6. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 678-679, 738-739 [Russian]
  7. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 88-89 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru