Ammonium Bifluoride (Crystals/Flakes)

Description

Ammonium hydrogen fluoride is a compound formed from ammonium fluoride and hydrogen fluoride, with hydrogen fluoride molecules occupying spaces in the crystal lattice similar to hydrated compounds. Thus it could be formulated as NH4F.HF, just like salts with water of crystallization. Ammonium hydrogen fluoride is the major constituent (though sometimes replaced by potassium hydrogen fluoride, in glass-etching fluid. It etches glass due to the fluorination of silicon:
SiO2(s) + 4NH4HF2(aq) →SiF4(l) + 4NH4F(aq) + 2H2O(l)

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