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Explain the Following Reactions Silicon Dioxide is Treated with Hydrogen Fluoride; - CBSE (Science) Class 11 - Chemistry

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Question

Explain the following reactions

Silicon dioxide is treated with hydrogen fluoride;

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

`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`

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APPEARS IN

 NCERT Solution for Chemistry Textbook for Class 11 (2018 to Current)
Chapter 11: The p-Block Elements
Q: 21.2 | Page no. 324
Solution Explain the Following Reactions Silicon Dioxide is Treated with Hydrogen Fluoride; Concept: Some Important Compounds of Carbon and Silicon - Silicon Dioxide.
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