Osmotic Pressure vs Vapor Pressure

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SUMMARY

This discussion centers on the relationship between osmotic pressure and vapor pressure, specifically whether calculating osmotic pressure can yield accurate vapor pressure results. Participants conclude that while both pressures are related to solutions, they are distinct phenomena. The correct approach to calculating vapor pressure involves understanding and applying Raoult's Law and Henry's Law, rather than relying solely on osmotic pressure calculations.

PREREQUISITES
  • Understanding of osmotic pressure and its calculation using the formula PI=iMRT.
  • Familiarity with vapor pressure concepts and measurement units like mmHg and ATM.
  • Knowledge of Raoult's Law and its application in vapor pressure calculations.
  • Basic principles of solution chemistry, including molarity and solute-solvent interactions.
NEXT STEPS
  • Study Raoult's Law and its implications for vapor pressure in solutions.
  • Research Henry's Law and its relevance to gas solubility and vapor pressure.
  • Learn about the differences between osmotic pressure and vapor pressure in detail.
  • Explore practical examples of calculating vapor pressure from solution data.
USEFUL FOR

Chemistry students, researchers in physical chemistry, and professionals involved in solution chemistry and thermodynamics will benefit from this discussion.

Michael Noto
If I were asked to calculate the vapor pressure, and I calculated the osmotic pressure and converted it to mmHg, Would I get the right answer?
 
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Michael Noto said:
If I were asked to calculate the vapor pressure, and I calculated the osmotic pressure and converted it to mmHg, Would I get the right answer?

I believe so, but l
 
Not like these things are completely unrelated, but in general no, these are separate phenomena.

Can you elaborate on why you think what you did is correct?
 
Borek said:
Not like these things are completely unrelated, but in general no, these are separate phenomena.

Can you elaborate on why you think what you did is correct?
Basically I was given some data about a solution and was asked to find the Vapor Pressure in mmHG. After calculating the Molarity, I had all of the pieces to solve for PI=iMRT so I did that then converted the answer in ATM to mmHG.
 
That's what you did, not why you think it is correct.

Calculating something just because you have data to do so, when you are asked to calculate something else, is rarely a correct approach to solving problems.
 
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Maybe you want to look up Henry's and Raoult's laws.
 
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