Sodium Fluoborate
Title: Sodium Fluoborate
CAS Registry Number: 13755-29-8
CAS Name: Sodium tetrafluoroborate
Additional Names: sodium borofluoride
Molecular Formula: BF4Na
Molecular Weight: 109.79
Percent Composition: B 9.85%, F 69.22%, Na 20.94%
Line Formula: NaBF4
Literature References: Prepd according to the equation 2H3BO3 + 8HF + Na2CO3 ® 2NaBF4 + 7H2O + CO2: Balz, Wilke-Dörfurt, 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.
Melting point: mp 384° (slight decompn)
Density: d20 2.47
Use: Fluorinating agent, see Lawton, Levy, J. Am. Chem. Soc. 77, 6083 (1955).

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