Sodium compounds: sodium fluoride

sodium symbol icon

The sodium in sodium fluoride formally is in the oxidation state 1.

Crystal structure of sodium fluoride

Sodium fluoride

  • Formula as often written: NaF
  • Hill system formula: F1Na1
  • CAS registry number: [7681-49-4]
  • Formula weight: 41.988
  • Class: fluoride

Synonyms

  • sodium fluoride
  • sodium(I) fluoride

Physical properties

  • Colour: white
  • Appearance: crystalline solid
  • Melting point: 996°C
  • Boiling point: 1695°C; 1704°C
  • Density: 2780 kg m-3

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Element analysis

Element percentages for the elements in sodium fluoride
Element %
F 45.25
Na 54.75

Synthesis

One way to make sodium fluoride is to react the hydroxide with hydrofluoric acid. The resulting salt can then be purified by recrystallization.

NaOH(aq) + HF(aq) → NaF(aq) + H2O(l)

While not a normal route of preparation because of the expense, sodium metal reacts vigorously with all the halogens to form sodium halides. So, it burns with fluorine, F2, to form sodium(I) fluoride, NaF.

2Na(s) + F2(g) → 2NaF(s)

Solid state structure

  • Geometry of sodium: 6 coordinate: octahedral
  • Prototypical structure: NaCl (rock salt)

Crystal structure of sodium fluoride

Isotope pattern

What follows is the calculated isotope pattern for the NaF unit with the most intense ion set to 100%.

Formula: Na1F1

mass  %
42 100.0 __________________________________________________

References

The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.

  • R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1960.
  • N.N. Greenwood and A. Earnshaw in Chemistry of the Elements, 2nd edition, Butterworth, UK, 1997.
  • F.A. Cotton, G. Wilkinson, C.A. Murillo, and M. Bochmann, in Advanced Inorganic Chemistry, John Wiley & Sons, 1999.
  • A.F. Trotman-Dickenson, (ed.) in Comprehensive Inorganic Chemistry, Pergamon, Oxford, UK, 1973.
  • R.W.G. Wyckoff, in Crystal Structures, volume 1, Interscience, John Wiley & Sons, 1963.
  • A.R.West in Basic solid state chemistry Chemistry, John Wiley & Sons, 1999.
  • A.F. Wells in Structural inorganic chemistry, 4th edition, Oxford, UK, 1975.
  • J.D.H. Donnay, (ed.) in Crystal data determinative tables, ACA monograph number 5, American Crystallographic Association, USA, 1963.
  • D.R. Lide, (ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 77th edition, 1996.
  • J.W. Mellor in A comprehensive treatise on inorganic and theoretical chemistry, volumes 1-16, Longmans, London, UK, 1922-1937.
  • J.E. Macintyre (ed.) in Dictionary of inorganic compounds, volumes 1-3, Chapman & Hall, London, UK, 1992.

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sodium atomic number