Non-ideal solution and vapour pressure

In summary, deviations in a solution's total vapor pressure can occur due to the strength of interactions between different components. This can result in scenarios where the interactions between A-A are stronger than A-B, while B-B are weaker than A-A, or vice versa. In these cases, the overall solution may appear ideal, but the individual vapor pressures of A and B may still exhibit positive and negative deviations. This raises the question of how such solutions should be classified.
  • #1
sgstudent
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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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  • #2
Yes, and yes.
 
  • #3
Interesting idea, hadn't thought of this question before.
 
  • #4
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?
 

Related to Non-ideal solution and vapour pressure

1. What is a non-ideal solution?

A non-ideal solution is a mixture of two or more substances that do not follow the ideal behavior of Raoult's Law. In an ideal solution, the vapor pressure of each component should be directly proportional to its mole fraction in the solution. However, in a non-ideal solution, the interactions between the molecules of the components can cause deviations from this behavior.

2. How does temperature affect the vapor pressure of a non-ideal solution?

Temperature can have a significant impact on the vapor pressure of a non-ideal solution. As temperature increases, the vapor pressure of the solution also increases. This is because higher temperatures cause the molecules in the solution to have more kinetic energy, leading to an increased tendency for them to escape into the gas phase.

3. What is the relationship between vapor pressure and composition in a non-ideal solution?

In a non-ideal solution, the vapor pressure of a component is not directly proportional to its mole fraction. Instead, the vapor pressure may be higher or lower than expected based on its mole fraction, depending on the interactions between the molecules of the components. This means that the vapor pressure and composition are not directly correlated in a non-ideal solution.

4. How can you determine the vapor pressure of a non-ideal solution?

The vapor pressure of a non-ideal solution can be determined using experimental methods such as distillation or vapor pressure measurements. Alternatively, theoretical models such as the activity coefficient model can be used to predict the vapor pressure of a non-ideal solution.

5. What are some real-life examples of non-ideal solutions?

Non-ideal solutions are commonly found in everyday life. For example, alcoholic beverages like wine and beer are non-ideal solutions as the interactions between the alcohol and water molecules cause deviations from ideal behavior. Additionally, gasoline, which is a mixture of various hydrocarbons, is also a non-ideal solution due to the interactions between the different components.

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