Mixture of pure nitric acid and pure hydrochloric

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Discussion Overview

The discussion revolves around the chemical behavior of a mixture of pure nitric acid and pure hydrochloric acid, specifically addressing the presence of H2NO3(+) and ClO4(-) ions in the mixture. The scope includes theoretical explanations and chemical reasoning related to acid strength and protonation.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • Some participants propose that HClO4 is a stronger acid than HNO3, leading to the protonation of HNO3 by HClO4.
  • Others argue that the basicity of the oxygens in HNO3 allows it to behave as a base towards the stronger acid, HClO4.
  • A participant suggests that the greater electronegativity of chlorine compared to nitrogen may contribute to the observed behavior of the acids.
  • One reply emphasizes considering the stronger conjugate acid-base pair in the overall reaction.

Areas of Agreement / Disagreement

Participants express differing views on the reasons behind the behavior of the acids, particularly regarding the basicity of HNO3 and the influence of electronegativity. No consensus is reached on the explanations provided.

Contextual Notes

The discussion does not resolve the underlying assumptions about acid strength and basicity, nor does it clarify the specific conditions under which the reactions occur.

josephcollins
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Hi People,
Could someone please give me a hand with this question : Explain why a mixture of pure nitric acid and pure hydrochloric (VII) acid (HClO4) contains H2NO3(+) ions and ClO4(-) ions.

Thanks a lot,
Joe
 
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HClO4 is a stronger acid than HNO3. The oxygens on the HNO3 are slightly basic, so they get protonated by the HClO4 to give the observed species.
 
Movies is right. There is always a stronger acid than a weaker one, so the weaker one can behave a base towards the strong acid.

You may wonder why the oxygens on HNO3 is more basic than that of HClO4. It is likely that chlorine has greater electronegativity than nitrogen, so the electronegativity totals are greater in HNO3. This may be the cause.

Regards
chem_tr
 
Yes, think in terms of the stronger conjugate acid -base pair inclusive of the overall reaction.


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