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Ammonium Hydrogen Fluoride
Ammonium hydrogen fluoride is a compound formed from ammonium fluoride and hydrogen fluoride, with hydrogen fluoride molecules occupying spaces in the ammonium fluoride crystal lattice. It is the major constituent in glass-etching fluid (though sometimes replaced by potassium hydrogen fluoride), etching occurring due to the fluorination of silicon
SiO2 (s) + 4[NH4][HF2] (aq) , SiF4 (l) + 4[NH4]F (aq) + 2H2O (l)
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