Ammonium bifluoride

Ammonium bifluoride is the inorganic compound with the formula [NH4][HF2] or [NH4]F·HF. It is produced from ammonia and hydrogen fluoride. This colourless salt is a glass-etchant and an intermediate in a once-contemplated route to hydrofluoric acid.

Ammonium bifluoride
Names
IUPAC name
Ammonium bifluoride
Other names
  • Ammonium acid fluoride
  • Ammonium hydrofluoride
  • Ammonium difluoride
  • Ammonium hydrogendifluoride
  • Ammonium hydrogen difluoride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.014.252
EC Number
  • 215-676-4
PubChem CID
UNII
UN number 1727
  • InChI=1S/F2H.H3N/c1-3-2;/h;1H3/q-1;/p+1 N
    Key: XIONBZYFLSJNBW-UHFFFAOYSA-O N
  • InChI=1/2FH.H3N/h2*1H;1H3
    Key: KVBCYCWRDBDGBG-UHFFFAOYAG
SMILES
  • [NH4+].F[H-]F
  • [F-].F.[NH4+]
Properties
[NH4][HF2]
Molar mass 57.044 g·mol−1
Appearance Colourless crystals
Density 1.50 g cm−3
Melting point 126 °C (259 °F; 399 K)
Boiling point 240 °C (464 °F; 513 K)(decomposes)
63g/(100 ml) (20 °C)
Solubility in alcohol slightly soluble
Refractive index (nD)
 1.390
Structure
Cubic, related to the CsCl structure
[NH4]+ cation: tetrahedral
[HF2]− anion: linear
Hazards
GHS labelling:
H301, H314
P280, P301+P310, P305+P351+P338, P310
NFPA 704 (fire diamond)
3
0
0
Related compounds
Other cations
 potassium bifluoride
Related compounds
 ammonium fluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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