1.

Why HF can't store in glass bottle

Answer»

HF is a weak acid still it is capable of reacting with glass. This is because of the fact that HF reacts with SiO2  to form [SiF6]2- ions which is quite stable. 

Hence, in order to store HF, we use wax-coated glass bottles.  

The equation for above reaction is as follows: 

SiO2 + 6HF → [SiF6]2-  + 2H+  + 2H2



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