Non-ideal solution and vapour pressure

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Discussion Overview

The discussion revolves around the behavior of non-ideal solutions and their vapor pressures, specifically exploring the conditions under which interactions between components can lead to deviations from ideality. Participants examine scenarios involving varying strengths of interactions between like and unlike molecules.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant suggests that deviations in vapor pressure are due to the strength of interactions between A-A and B-B compared to A-B, questioning if stronger A-A interactions and weaker B-B interactions could lead to a scenario resembling ideal behavior overall, despite individual deviations.
  • Another participant agrees with the initial proposition, affirming the possibility of such interactions.
  • A third participant expresses interest in the question, indicating it is a novel consideration for them.
  • A subsequent reply reiterates agreement with the initial idea and raises a question about the classification of the solution, suggesting it may not be considered ideal despite the overall vapor pressure behavior.

Areas of Agreement / Disagreement

Participants generally agree on the possibility of the proposed scenario, but there is no consensus on how to classify the solution under these conditions, indicating an unresolved aspect of the discussion.

Contextual Notes

The discussion does not resolve the implications of the proposed interactions on the classification of the solution, leaving open questions about definitions and criteria for ideality.

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When there is a positive or negative deviation it is due to the interactions between A-A and B-B being weaker or stronger than the interactions between A-B. However, are there any scenarios where the interactions between A-A are stronger than A-B while B-B weaker than A-A or vice versa?

In such a case would it be possible that the overall total vapour pressure of the solution to look like an ideal solution but the individual vapour pressure of A and B having positive and negative deviations?
 
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Yes, and yes.
 
Interesting idea, hadn't thought of this question before.
 
Bystander said:
Yes, and yes.
Hmm in such a case what would the solution be classified as? Because it shouldn't be an ideal solution still right?
 

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