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Properties of substance:

potassium hydrogen fluoride

Group of substances:

inorganic

Physical appearance:

colorless tetragonal crystals

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

HF2K

Structural formula as text:

KHF2

Molar/atomic mass: 78.1

Melting point (°C):

239

Decomposition temperature (°C):

400

Solubility (g/100 g of solvent):

ethanol: insoluble [Ref.]
water: 24.5 (0°C) [Ref.]
water: 30.1 (10°C) [Ref.]
water: 39.2 (20°C) [Ref.]
water: 61.4 (45°C) [Ref.]
water: 78.8 (60°C) [Ref.]
water: 114 (80°C) [Ref.]

Density:

2.35 (20°C, g/cm3)

Reactions:

  1. Yeild 85%. [Ref.1]
    KHF2 + H2SO4 + 2SO3 → 2HSO3F + KHSO4
  2. [Ref.1aster]
    KHF2 → KF + HF

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

-928.45 (s)

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

-860.45 (s)

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

104.6 (s)

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

76.82 (s)

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

6.61

Enthalpy (heat) of solution ΔsolH (kJ)

-39.9 (s) [Ref.]

References:

  1. Галкин Н.П., Зайцев В.А., Серегин М.Б. Улавливание и переработка фторсодержащих газов. - М.: Атомиздат, 1975. - pp. 56 [Russian]
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 70 [Russian]
  3. Рысс И.Г. Химия фтора и его неорганических соединений. - М., 1956. - pp. 112-115, 118-122 [Russian]
  4. Успехи химии. - 1970. - Т.39, №12. - pp. 2104 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru