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Question
Explain the following reaction.
Silicon dioxide is treated with hydrogen fluoride.
Answer in Brief
Solution
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
\[\ce{SiO_2 + 4HF -> SiF_4 + 2H_2O}\]
The SiF4 formed in this reaction can further react with HF to form hydrofluorosilicic acid.
\[\ce{SiF_4 + 2HF -> H_2SiF_6}\]
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Some Important Compounds of Carbon and Silicon - Silicon Dioxide
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Chapter 11: The p-Block Elements - EXERCISES [Page 332]
