1.

Why HF acid is stored in wax coated glass bottle ?

Answer»

This is because HF does not attack wax but reacts with glass.It dissolves SiO2 present in glass forming hydrofluorosilicic acid. 

SiO2 + 6HF → H2SiF6 + 2H2O

[Hint : HF is corrosive, hence HF attacks glass surface.]



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