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Properties of substance:

sodium hydrogen fluoride

Synonyms:

sodium hydrogen fluoride

Group of substances:

inorganic

Physical appearance:

white hexagonal crystals

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

HF2Na

Structural formula as text:

NaHF2

Molar/atomic mass: 61.995

Decomposition temperature (°C):

270

Solubility (g/100 g of solvent):

water: 2.33 (0°C) [Ref.]
water: 3.25 (20°C) [Ref.]
water: 5.17 (40°C) [Ref.]
water: 7.5 (90°C) [Ref.]

Density:

2.08 (20°C, g/cm3)

Reactions:

  1. [Ref.1]
    H3BO3 + 2NaHF2 → NaBF4 + NaOH + 2H2O

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

-920.3 (s)

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

-852.2 (s)

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

90.9 (s)

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

75 (s)

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-90
  2. Галкин Н.П., Зайцев В.А., Серегин М.Б. Улавливание и переработка фторсодержащих газов. - М.: Атомиздат, 1975. - pp. 56 [Russian]
  3. Рысс И.Г. Химия фтора и его неорганических соединений. - М., 1956. - pp. 112-118 [Russian]
  4. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 146-147 [Russian]
  5. Успехи химии. - 1970. - Т.39, №12. - pp. 2108 [Russian]
  6. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 362 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru