Ammonium bifluoride

Ammonium bifluoride
Names
	IUPAC name Ammonium bifluoride
	Other names Ammonium acid fluoride; Ammonium hydrofluoride; Ammonium difluoride; Ammonium hydrogendifluoride; Ammonium hydrogen difluoride;
Identifiers
CAS Number	1341-49-7 ;
3D model (JSmol)	Interactive image; Interactive image;
ChemSpider	21241205 ;
ECHA InfoCard	100.014.252
EC Number	215-676-4;
PubChem CID	14935;
UNII	C2M215358O;
UN number	1727
CompTox Dashboard (EPA)	DTXSID9029645 ;
	InChI InChI=1S/F2H.H3N/c1-3-2;/h;1H3/q-1;/p+1 Key: XIONBZYFLSJNBW-UHFFFAOYSA-O ; InChI=1/2FH.H3N/h2*1H;1H3 Key: KVBCYCWRDBDGBG-UHFFFAOYAG;
	SMILES [NH4+].F[H-]F; [F-].F.[NH4+];
Properties
Chemical formula	[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)
Solubility in water	63g/(100 ml) (20 °C)
Solubility in alcohol	slightly soluble
Refractive index (nD)	1.390
Structure
Crystal structure	Cubic, related to the CsCl structure
Coordination geometry	[NH4]+ cation: tetrahedral; [HF2]− anion: linear
Hazards
	GHS labelling:
Pictograms
Hazard statements	H301, H314
Precautionary statements	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). verify (what is ?) Infobox references

Ammonium bifluoride is an 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.