hydrogen iodine is stronger acid than hydrogen fluoride in aqueous solution why
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Why HI is stronger acid than HF?
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Sean Altar, studied Physics & Chemistry at Amity University
Answered Dec 27 2016
Iodine(I) has a bigger atomic radius than Fluorene (F). Due to its greater size, the distance between the valence electron and the nucleus is great than Fluorene.
Due to the large distance, when is makes a bond, the distance between H+ and the nucleus of I is greater as compared to F and H+.
Due to large bond length, bond strength is low and, thus, it is easy to break. And therefore more reactive.
While in F and H+, the bond length is significantly less and thus strengthening the bond. Therefore the bond is difficult to break.
Therefore HI is better acid as the H+ is dissociated faster while HF is not a good acid due to its low dissociation enthalpy.
Still have a question? Ask your own!
What is your question?
40 ANSWERS

Sean Altar, studied Physics & Chemistry at Amity University
Answered Dec 27 2016
Iodine(I) has a bigger atomic radius than Fluorene (F). Due to its greater size, the distance between the valence electron and the nucleus is great than Fluorene.
Due to the large distance, when is makes a bond, the distance between H+ and the nucleus of I is greater as compared to F and H+.
Due to large bond length, bond strength is low and, thus, it is easy to break. And therefore more reactive.
While in F and H+, the bond length is significantly less and thus strengthening the bond. Therefore the bond is difficult to break.
Therefore HI is better acid as the H+ is dissociated faster while HF is not a good acid due to its low dissociation enthalpy.
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In HI iodine is less electronegative and it has large size. Therefore bonding between hydrogen and iodide is weaker. It will easily split in comparision of HF. Due to more liberation of H+ ions HI is stronger acid.
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