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Properties of substance:

potassium fluoroborate

Synonyms:

potassium tetrafluoroborate

Group of substances:

inorganic

Physical appearance:

colorless rhombic crystals

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

BF4K

Structural formula as text:

KBF4

Molar/atomic mass: 125.91

Melting point (°C):

530

Decomposition temperature (°C):

930

Solubility (g/100 g of solvent):

diethyl ether: sparingly soluble [Ref.]
ethanol: insoluble (20°C) [Ref.]
ethanol: slightly soluble (78°C) [Ref.]
propylene carbonate: 0.18 (25°C) [Ref.]
water: 0.45 (20°C) [Ref.]
water: 1 (33°C) [Ref.]
water: 6.27 (100°C) [Ref.]

Density:

2.5 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1aster]
    KOH + HBF4 → KBF4 + H2O

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

-1884 (s)

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

130 (s)

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

115 (s)

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

18

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 4-82
  2. Inorganic Syntheses. - Vol. 1. - New York and London, 1939. - pp. 24-26
  3. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 134-135 [Russian]
  4. Новый справочник химика и технолога. Химическое равновесие. Свойства растворов. - СПб.: НПО Профессионал, 2004, 2007. - pp. 209 [Russian]
  5. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 40-41 [Russian]
  6. Химическая энциклопедия. - Т. 5. - М.: Советская энциклопедия, 1999. - pp. 204 [Russian]
  7. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 234 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru