Explain the following reactions
Silicon dioxide is treated with hydrogen fluoride;
When silicon dioxide (SiO2) is heated with hydrogen fluoride (HF), it forms silicon tetrafluoride (SiF4). Usually, the Si–O bond is a strong bond and it resists any attack by halogens and most acids, even at a high temperature. However, it is attacked by HF
`SiO_2 + 4HF -> SiF_4 + 2H_2O`
The SiF4 formed in this reaction can further react with HF to form hydrofluorosilicic acid.
`SiF_4 + 2HF -> H_2SiF_6`