Sodium tetrafluoroborate

Sodium tetrafluoroborate

Names
Other names sodium fluoroborate, NaBF4
Identifiers
CAS Number	13755-29-8 Y
3D model (JSmol)	Interactive image
ChemSpider	24462 N
ECHA InfoCard	100.033.931
PubChem CID	4343483
UNII	CFC805A5WR Y
CompTox Dashboard (EPA)	DTXSID9021477
InChI InChI=1S/BF4.Na/c2-1(3,4)5;/q-1;+1
SMILES [B-](F)(F)(F)F.[Na+]
Properties
Chemical formula	NaBF4
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). N verify (what is YN ?) 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]

Preparation

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.

References