Which one is a stronger acid- HOCl or HOI?

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Discussion Overview

The discussion centers on the comparative acidity of hypochlorous acid (HOCl) and hypoiodous acid (HOI), exploring the underlying reasons for the differences in their acid strengths. The conversation includes considerations of molecular structure, electronegativity, and bond characteristics.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant notes that HI is a stronger acid than HCl due to the weak H-I bond, but questions why HOCl is considered a stronger acid than HOI.
  • Another participant suggests examining the structures of HOCl and HOI, indicating that the hydrogen is not directly bonded to the halogen and prompts consideration of how chlorine's electronegativity affects the H-O bond.
  • A later reply indicates an understanding that chlorine's higher electronegativity withdraws electron density from oxygen, which may facilitate the release of H+.
  • Another participant briefly comments on the concept of withdrawing oxygen and attracting electrons without further elaboration.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the acidity of HOCl and HOI, with some agreement on the role of electronegativity but no consensus on the overall comparison of acid strengths.

Contextual Notes

Participants reference the structures and electronegativities of the involved elements, but the discussion does not resolve the complexities of how these factors quantitatively affect acidity.

zorro
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I know that HI is a stronger acid that HCl because of the weak H-I bond which can break easily in aqueous solution. But I can't understand why HOCl is a stronger acid that HOI (as per my book)?
 
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Check their structures (hint: H isn't bonded directly to the halogen in either case). How do you think Cl will affect the H-O bond in comparison with I? Think about electronegativities here...
 
I got it. Chlorine being more electronegative atom withdraws oxygen towards itself, facilitating the release of H+
Thanks.
 
Abdul Quadeer said:
withdraws oxygen

Attracts electrons.
 

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