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Sodium tetrafluoroborate

Sodium tetrafluoroborate
The sodium cation
The tetrafluoroborate anion (ball-and-stick model)
Other names
sodium fluoroborate, NaBF4
3D model (JSmol)
ECHA InfoCard 100.033.931
Molar mass 109.794 g/mol
Density 2.47 g/cm3
Melting point 384 °C (723 °F; 657 K)
Related compounds
Other cations
Nitrosonium tetrafluoroborate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Sodium tetrafluoroborate is an inorganic compound with formula NaBF4. It is a salt that forms colorless or white water-soluble rhombic crystals and is soluble in water (108 g/100 mL) but less soluble in organic solvents.[1]

Sodium tetrafluoroborate is used in some fluxes used for brazing and to produce boron trifluoride.[2]


Sodium tetrafluoroborate can be prepared by neutralizing tetrafluoroboric acid with sodium carbonate or sodium hydroxide.[3]

NaOH + HBF4 → NaBF4 + H2O
Na2CO3 + 2 HBF4 → 2 NaBF4 + H2O + CO2

Alternatively the chemical can be synthesized from boric acid, hydrofluoric acid, and sodium carbonate:[2]

2H3BO3 + 8HF + Na2CO3 → 2NaBF4 + 7H2O + CO2

Reactions and uses

On heating to its melting point, sodium tetrafluoroborate decomposes to sodium fluoride and boron trifluoride:[4]

NaBF4 → NaF + BF3

It is a source of tetrafluoroborate anion, which is used in organic chemistry for the preparation of salts. Sodium tetrafluoroborate can be used for synthesis of ionic liquids, where tetrafluoroborate is the anion.


  1. ^ Milne, G. W. A (2005-07-11). "Gardner's Commercially Important Chemicals: Synonyms, Trade Names, and Properties". ISBN 9780471735182. Cite journal requires |journal= (help)
  2. ^ a b Brauer, Georg (1963). Handbook of Preparative Inorganic Chemistry Vol. 1, 2nd Ed. Newyork: Academic Press. p. 220 & 222. ISBN 978-0121266011.
  3. ^ Eagleson, Mary (1994). "Concise Encyclopedia Chemistry". ISBN 9783110114515. Cite journal requires |journal= (help)
  4. ^ Richard j. Lewis, Sr (2008-07-14). "Hazardous Chemicals Desk Reference". ISBN 9780470334454. Cite journal requires |journal= (help)
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