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SiO2 is treated with HF....

`SiO_2` is treated with HF.

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`SiO_2` reacts with HF to form silicon tetrafluoride. The initially formed `SiF_4` dissolves in HF to form hydrofluorosilicic acid.
`SiO_2 + 4HF-SiF_4 + 2H_2O, SiF_4 + 2HF to H_2SiF_6`
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