Ammonium tetrafluoroborate
Names
IUPAC name
Ammonium tetrafluoroborate
Other names
  • Ammonium fluoroborate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.034.106 Edit this at Wikidata
EC Number
  • 237-531-4
UNII
UN number 1759 3077
  • InChI=1S/BF4.H3N/c2-1(3,4)5;/h;1H3/q-1;/p+1
    Key: PDTKOBRZPAIMRD-UHFFFAOYSA-O
  • [B-](F)(F)(F)F.[NH4+]
Properties
NH4BF4
Molar mass 104.85 g/mol
Appearance Colorless to white crystals[1]
Density 1.871 g/cm3
Melting point 220-230 °C (Sublimes)[2]
Boiling point N/A
3.09 g/100 ml (-1.0 °C)
5.26 g/100 ml (-1.5 °C)
10.85 g/100 ml (-2.7 °C)
12.20 g/100 ml (0 °C)
25 g/100 ml (16 °C)
25.83 g/100 ml (25 °C)
44.09 g/100 ml (50 °C)
67.50 g/100 ml (75 °C)
98.93 g/100 ml (100 °C)
113.7 g/100 ml (108.5 °C)
Solubility Ammonium hydroxide[3]
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Corrosive, irritant, toxic if ingested
GHS labelling:
GHS05: CorrosiveGHS07: Exclamation mark
Warning
H290, H314, H315, H319, H335
P234, P260, P261, P264, P271, P280, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P321, P332+P313, P337+P313, P362, P363, P390, P403+P233, P404, P405, P501
Safety data sheet (SDS) [1]
Related compounds
Other anions
 Tetrafluoroborate
Other cations
 Ammonium
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Ammonium tetrafluoroborate (or ammonium fluoroborate) is an inorganic salt composed of the ammonium cation and the tetrafluoroborate anion, with the chemical formula NH4BF4. When heated to decomposition, ammonium tetrafluoroborate releases toxic fumes of hydrogen fluoride, nitrogen oxides, and ammonia.[4]

Preparation

Ammonium tetrafluoroborate can be prepared by reacting ammonium fluoride with boric and sulfuric acid:[5]

8 NH4F + 2 H3BO3 + 3 H2SO4 → 2 NH4BF4 + 3 (NH4)2SO4 + 6 H2O

References

  1. ^ "Ammonium Fluoroborate". American Elements. Retrieved 26 January 2021.
  2. ^ Gregory, K. Friestad; Branchaud, Bruce P. (15 April 2001). "Ammonium Tetrafluoroborate". Encyclopedia of Reagents for Organic Synthesis.
  3. ^ Lewis, R. J. (1999). Sax's Dangerous Properties of Industrial Materials. Vol. 1–3 (10 ed.). New York, NY: Van Nostrand Reinhold. p. 233.
  4. ^ Lewis, R. J. (1997). Sax's Dangerous Properties of Industrial Materials. Vol. 1–3 (9 ed.). New York, NY: Van Nostrand Reinhold. p. 209.
  5. ^ "Preparation of ammonium fluoroborate". Prepchem. Retrieved 26 January 2021.
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