Why is HF not stored in plain glass bottles - Chemistry - The p-Block Elements

Question

Why is HF not stored in plain glass bottles?

Mohit Gupta · Accepted 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+ + 2H2O