Ammonium bifluoride has been considered as an intermediate in the production of hydrofluoric acid from hexafluorosilicic acid. Thus, hexafluorosilicic acid is hydrolyzed to give ammonium fluoride. Ammonium bifluoride is a component of some etchants. It attacks silica component of glass:
SiO2 + 4 [NH4][HF2] → SiF4 + 4 [NH4]F + 2 H2OPotassium bifluoride is a related more commonly used etchant.
Ammonium bifluoride has been considered as an intermediate in the production of hydrofluoric acid from hexafluorosilicic acid. Thus, hexafluorosilicic acid is hydrolyzed to give ammonium fluoride, which thermally decomposes to give the bifluoride:
H2SiF6 + 6 NH3 + 2 H2O → SiO2 + 6 NH4F2 NH4F → NH3 + [NH4]HF2
The resulting ammonium bifluoride is converted to the sodium bifluoride, which thermally decomposes to release HF.
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