Hydrofluoric acid (HF) cannot be stored in gl | vedclass

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Question

(C) Hydrofluoric acid $(HF)$ reacts with silica $(SiO_2)$ present in glass to form silicon tetrafluoride $(SiF_4)$.The chemical reaction is: $SiO_2(s)

Vedclass · Accepted Answer

$SiF_4$

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(C) Hydrofluoric acid $(HF)$ reacts with silica $(SiO_2)$ present in glass to form silicon tetrafluoride $(SiF_4)$.The chemical reaction is: $SiO_2(s) + 4HF(aq) \rightarrow SiF_4(g) + 2H_2O(l)$.Further,$SiF_4$ can react with excess $HF$ to form hydrofluorosilicic acid $(H_2SiF_6)$: $SiF_4(g) + 2HF(aq) \rightarrow H_2SiF_6(aq)$.Therefore,$HF$ is stored in wax-coated bottles or plastic containers instead of glass.

Hydrofluoric acid $(HF)$ cannot be stored in glass bottles because it reacts with glass $(SiO_2)$ to form:

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