Ammonium bifluoride
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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.
Quick Facts Names, Identifiers ...
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Names | |||
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IUPAC name
Ammonium bifluoride | |||
Other names
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Identifiers | |||
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.014.252 | ||
EC Number |
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PubChem CID |
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UNII | |||
UN number | 1727 | ||
CompTox Dashboard (EPA) |
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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: | |||
[1] | |||
H301, H314[1] | |||
P280, P301+P310, P305+P351+P338, P310[1] | |||
NFPA 704 (fire diamond) | |||
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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