Sodium tetrafluoroborate

Structural formula
General
Surname	Sodium tetrafluoroborate
other names	Sodium tetrafluoroborate; Sodium tetrafluoridoborate (current nomenclature) ;
Molecular formula	Na [BF 4 ]
Brief description	crystalline, colorless solid
External identifiers / databases
EC number	237-340-6
ECHA InfoCard	100.033.931
PubChem	4343483
Wikidata	Q425190
properties
Molar mass	109.80 g mol −1
Physical state	firmly
density	2.47 g cm −3
Melting point	384 ° C
solubility	very light in water (1080 g l −1 at 26 ° C)
safety instructions
GHS labeling of hazardous substances danger
H and P phrases	H: 314
	P: 280-301 + 330 + 331-305 + 351 + 338-308 + 310
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Sodium tetrafluoroborate is a chemical compound from the group of sodium compounds , boron-halogen compounds and fluorine complexes .

Extraction and presentation

Like most of the usual tetrafluoroborates, sodium tetrafluoroborate can be reacted with the tetrafluoridoboric acid by reaction or neutralization of sodium hydroxide or sodium carbonate .

{\ displaystyle \ mathrm {NaOH + HBF_ {4} \ longrightarrow NaBF_ {4} + H_ {2} O}}

{\ displaystyle \ mathrm {Na_ {2} CO_ {3} +2 \ HBF_ {4} \ longrightarrow 2 \ NaBF_ {4} + H_ {2} O + CO_ {2}}}

properties

Sodium tetrafluoroborate is a non-flammable white crystalline solid which is very easily soluble in water and slowly decomposes in the process.

use

Sodium tetrafluoroborate is also mentioned as a protective agent in sand mold casting of magnesium alloys . However, it is more common to use boric acid as an additive to the molding sand mixture.

Alkali metal fluoroborates are generally used in fluxes for soldering and brazing and are used as catalysts in organic synthesis and polymerization reactions. In aluminum foundries, the fluoroborates, like the fluorotitanates, are added to the melts as part of products to influence the grain structure (see melt treatment ).

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g Entry on sodium tetrafluoroborate in the GESTIS substance database of the IFA , accessed on January 9, 2019(JavaScript required) .
↑ Oleg Podobed: Development of sand molding technologies for the production of prototypes and cast parts from magnesium alloys , dissertation, Technical University Bergakademie Freiberg, 2003, urn : nbn: de: swb: 105-1910983 .
↑ Toxicological evaluation of tetrafluoroboric acid and salts (PDF) at the professional association raw materials and chemical industry (BG RCI), accessed on August 22, 2012.

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f ^g Entry on sodium tetrafluoroborate in the GESTIS substance database of the IFA , accessed on January 9, 2019(JavaScript required) .

[2] Oleg Podobed: Development of sand molding technologies for the production of prototypes and cast parts from magnesium alloys , dissertation, Technical University Bergakademie Freiberg, 2003, urn : nbn: de: swb: 105-1910983 .

[3] Toxicological evaluation of tetrafluoroboric acid and salts (PDF) at the professional association raw materials and chemical industry (BG RCI), accessed on August 22, 2012.