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Properties of substance:

potassium hexafluorosilicate

Group of substances:

inorganic

Physical appearance:

colorless hexagonal crystals

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

F6K2Si

Structural formula as text:

K2SiF6

Molar/atomic mass: 220.27

Melting point (°C):

873

Solubility (g/100 g of solvent):

ethanol: insoluble [Ref.]
water: 0.077 (0°C) [Ref.]
water: 0.12 (17.5°C) [Ref.]
water: 0.177 (25°C) [Ref.]
water: 0.42 (70°C) [Ref.]
water: 0.954 (100°C) [Ref.]

Density:

2.67 (15°C, g/cm3)

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

-2956 (s)

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

-2798.6 (s)

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

226 (s)

References:

  1. Binneweis M., Milke E. Thermochemical Data of Elements and Compounds. - 2ed, 2002. - pp. 523
  2. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 4-82
  3. Journal of Fluorine Chemistry. - 1984. - Vol. 24, №3. - pp. 345-354
  4. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 134-135 [Russian]
  5. Рысс И.Г. Химия фтора и его неорганических соединений. - М., 1956. - pp. 363-365 [Russian]
  6. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 172 [Russian]
  7. Фтор и его соединения. – Под ред. Саймонса Дж., Т. 1. - М.: ИИЛ, 1953. - pp. 118-119 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru