Imagine a solution of two liquids in which the molecules interact more favorably than they do in the individual liquids. Will this solution deviate positively from, deviate negatively from, or ideally follow Raoult's law? View Available Hint/s)
Imagine a solution of two liquids in which the molecules interact more favorably than they do in the individual liquids. Will this solution deviate positively from, deviate negatively from, or ideally follow Raoult's law? View Available Hint/s)
Chapter84: Fractional Distillation, Azeotropes
Section: Chapter Questions
Problem 2P
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Transcribed Image Text:Learning Goal:
To understand deviations from the ideal vapor
pressure for solutions of two liquids.
Part B
Raoult's law is used to predict the vapor pressure of
an ideal solution that contains one or more volatile
components. For a solution with only one
component
Imagine a solution of two liquids in which the molecules interact more favorably than they do in the individual liquids. Will this
solution deviate positively from, deviate negatively from, or ideally follow Raoult's law?
• View Available Hint(s)
Peoln = Poly X Xgolv
O Itwill deviate positively.
where Poln is the vapor pressure of gaseous
solvent above the solution, Psoly is the vapor
O twill deviate negatively.
pressure of the pure solvent, and Xoly is the mole
fraction of the solvent.
O It will be an ideal solution.
An assumption of Raoult's law is that the
interactions between the different components of
the solution are similar in magnitude to the
interactions of each of the components with
themselves; in other words, the components form
an ideal solution. Deviations from this law are
observed when interactions between solute and
solvent are not similar.
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Part C
Imagine a solution of two liquids that are so similar that their interactions together are the same as in the individual liquids, Will
this solution deviate positively from, deviate negatively from, or ideally follow Raoult's law?
O It will deviate positively.
O It will deviate negatively.
O It will be an ideal solution.
Expert Solution
Step 1
Raoult’s law: The vapor pressure of the solution is equal to the mole fraction and vapor pressure of the solvent at that temperature.
Fundamentals
According to Raoult’s law,
Cohesive force:
A force of attraction between like molecules
Adhesive force:
A force of attraction between unlike molecules
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