Use polarity and bond strength arguments to explain why HF is a stronger acid than H2O.

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter19: The Chemistry Of The Main-group Elements
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  1. Use polarity and bond strength arguments to explain why HF is a stronger acid than H2O.
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The polarity of a covalent bond is defined by using the electronegativities of the bonded atoms. Greater the difference in the electronegativities, higher will be the polarity of the bond. So, F is more electronegative than that of O atom . So, H-F bond will be more polar than that of H-O bond. 

The bond strength is inversely proportional to the bond length. Due the greater atomic size of O than F, H-O has more bond length than H-F bond. So, the bond strength of H-F bond is more than that of H-O bond.

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