Nomenclature
CAS number: 13755-29-8
Sodium tetrafluoroborate; sodium borofluoride.
BF
4Na; mol wt 109.79.
B 9.85%, F 69.22%, Na 20.94%.
NaBF
4.
Description and references
Prepd according to the equation 2H3BO3 + 8HF + Na2CO3 → 2NaBF4 + 7H2O + CO2: Balz, Wilke-Drfurt, Z. Anorg. Allg. Chem. 159, 197
(1927); Kwasnik in Handbook of Preparative
Inorganic Chemistry vol. 1, G. Brauer, Ed.
(Academic Press, New York, 2nd ed., 1963) p 222.
Properties
Orthorhombic, stout rectangular prisms, d20 2.47. mp 384° (slight decompn). Does not etch glass when absolutely dry. Soly in water (g/100
ml): 108 (26°); 210 (100°). Sparingly sol in alcohol. Aq solns
have a bitter taste and are acid to litmus.Use
Fluorinating agent,
see Lawton, Levy,
J. Am. Chem. Soc. 77, 6083 (1955).