Non-ideal solution and vapour pressure

Click For Summary
SUMMARY

The discussion centers on the behavior of solutions exhibiting positive and negative deviations from ideality, specifically in terms of vapor pressure. It establishes that interactions between components A-A and B-B can influence the overall vapor pressure, potentially leading to scenarios where the total vapor pressure appears ideal while individual components display deviations. The participants confirm that such a solution would not be classified as ideal despite the total vapor pressure resembling that of an ideal solution.

PREREQUISITES
  • Understanding of Raoult's Law and its application to vapor pressure.
  • Knowledge of positive and negative deviation concepts in solutions.
  • Familiarity with intermolecular interactions (A-A, B-B, A-B).
  • Basic principles of thermodynamics related to phase equilibria.
NEXT STEPS
  • Research Raoult's Law and its implications for non-ideal solutions.
  • Study the effects of intermolecular forces on vapor pressure deviations.
  • Explore thermodynamic models for predicting solution behavior.
  • Investigate case studies of solutions with mixed interactions and their classifications.
USEFUL FOR

Chemists, chemical engineers, and students studying solution chemistry and thermodynamics, particularly those interested in vapor pressure behavior and solution classification.

sgstudent
Messages
726
Reaction score
3
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?
 
Physics news on Phys.org
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?
 

Similar threads

Understanding Vapour Pressure & Temperature Difference
  • · Replies 18 ·
Replies
18
Views
3K
Partial Pressures and Vapour Pressure
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Raoult's law and pressure changes
  • · Replies 27 ·
Replies
27
Views
5K
Undergrad "Air Pressure" is not "the weight of the air above you"
  • · Replies 27 ·
Replies
27
Views
5K
Can Total Energy Be the Same in Liquid and Vapour Phases at Equilibrium?
  • · Replies 2 ·
Replies
2
Views
2K
The Pressure of a liquid in equilibrium?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate No slip condition in an ideal fluid- Perpendicular pressure
  • · Replies 13 ·
Replies
13
Views
4K
Exploring Pressure Variations of CO2 Gas at 200°C
  • · Replies 5 ·
Replies
5
Views
2K
Combustion of an explosive liquid bubble
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Fugacity coefficient of an ideal solution
  • · Replies 1 ·
Replies
1
Views
4K