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Properties of substance:

sodium fluoride

Group of substances:

inorganic

Physical appearance:

colorless cubic crystals

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

FNa

Structural formula as text:

NaF

Molar/atomic mass: 41.99

Melting point (°C):

992

Boiling point (°C):

1700

Solubility (g/100 g of solvent):

1-butanol: 0.003 (20°C) [Ref.]
acetone: 0.0000024 (18°C) [Ref.]
acetone: 0.0000027 (37°C) [Ref.]
acetonitrile: 0.0014 (18°C) [Ref.]
acetonitrile: 0.00015 (25°C) [Ref.]
acetonitrile: 0.003 (25°C) [Ref.]
ammonia liquid : 0.35 (25°C) [Ref.]
benzene: 0.000026 (25°C) [Ref.]
bromine trifluoride: 2.12 (25°C) [Ref.]
bromine trifluoride: 2.62 (70°C) [Ref.]
cyclohexane: insoluble [Ref.]
dimethylformamide: 0.0002 (25°C) [Ref.]
ethanol: 0.095 (20°C) [Ref.]
ethanol: 0.108 (30°C) [Ref.]
ethanol: 0.119 (40°C) [Ref.]
ethanol: 0.158 (50°C) [Ref.]
ethanol: 0.179 (55°C) [Ref.]
hydrogen fluoride : 22.1 (-24.3°C) [Ref.]
hydrogen fluoride : 25.1 (-9.8°C) [Ref.]
hydrogen fluoride : 30.1 (11°C) [Ref.]
hydrogen peroxide: 4.9 (-5.2°C) [Ref.]
methanol: 0.413 (20°C) [Ref.]
methyl acetate: insoluble [Ref.]
propylene carbonate: 0.0002 (25°C) [Ref.]
sulfur dioxide: 0.029 (0°C) [Ref.]
tetrahydrofuran: 0.00085 (24°C) [Ref.]
water: 4.11 (0°C) [Ref.]
water: 4.28 (20°C) [Ref.]
water: 4.54 (40°C) [Ref.]
water: 4.69 (80°C) [Ref.]
water: 4.96 (94°C) [Ref.]

Multicomponent solubility (in wt%):

water 92.53%, ferric fluoride 7.32%, sodium fluoride 0.15%, 25 °C, separating phase: FeF3 * 3H2O + 2FeF3 * 5NaF [Ref.]
water 97.33%, ferric fluoride 2.51%, sodium fluoride 0.16%, 25 °C, separating phase: 2FeF3 * 5NaF [Ref.]
water 98.24%, ferric fluoride 1.58%, sodium fluoride 0.18%, 25 °C, separating phase: 2FeF3 * 5NaF [Ref.]
water 98.96%, ferric fluoride 0.84%, sodium fluoride 0.2%, 25 °C, separating phase: 2FeF3 * 5NaF [Ref.]
water 99.45%, ferric fluoride 0.34%, sodium fluoride 0.21%, 25 °C, separating phase: 2FeF3 * 5NaF [Ref.]
water 99.66%, ferric fluoride 0.12%, sodium fluoride 0.22%, 25 °C, separating phase: 2FeF3 * 5NaF [Ref.]
water 99.758%, ferric fluoride 0.012%, sodium fluoride 0.23%, 25 °C, separating phase: 2FeF3 * 5NaF [Ref.]
water 98.9996%, ferric fluoride 0.0004%, sodium fluoride 1.%, 25 °C, separating phase: 2FeF3 * 5NaF [Ref.]
water 99.658%, aluminum fluoride 0.303%, sodium fluoride 0.039%, 25 °C, separating phase: 4AlF3 * 11NaF [Ref.]
water 99.823%, aluminum fluoride 0.059%, sodium fluoride 0.118%, 25 °C, separating phase: 4AlF3 * 11NaF [Ref.]
water 98.719%, aluminum fluoride 0.001%, sodium fluoride 1.28%, 25 °C, separating phase: 4AlF3 * 11NaF [Ref.]

Density:

2.79 (20°C, g/cm3)

Reactions:

  1. [Ref.1]
    2O2[PtF6] + 2NaF → 2Na[PtF6] + O2F2 + O2

Vapour pressure (Torr):

0.1 (916°C)
1 (1075°C)
10 (1238°C)
100 (1452°C)

Viscosity (mPa·s):

1.85 (1015°C)
1.41 (1110°C)
1.14 (1200°C)

Surface tension (mN/m):

185 (1000°C)
181 (1050°C)
179 (1080°C)

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

-573.6 (s)

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

-543.3 (s)

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

51.3 (s)

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

46.82 (s)

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

32.6

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

209

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

-288 (g)

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

217.5 (g)

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

34.22 (g)

LD50 (mg/kg):

200 (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. 850
  2. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1257-1260
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 86 [Russian]
  4. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 651-653, 739 [Russian]
  5. Токсикологический вестник. - 2004. - №3. - pp. 38 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru