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General Chemistry

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Deviations from Raoult's Law

CHEM-EXBLRU

Raoult’s law applies to an ideal solution in which interactions between A and B molecules are similar in strength to interactions between A molecules in pure liquid A, and interactions between B molecules in pure liquid B.

The solid line in the attached figure represents the vapor pressure of $CS_{2}$ as a function of mole fraction in a non-ideal solution of $CS_{2}$ and acetone. The dotted line is the ‘Raoult’s law’ line shown for reference.

What might account for the deviation from Raoult’s law experienced by this solution?

Created for Albert.io. Copyright 2016. All rights reserved.

A

The intermolecular forces between acetone and $CS_{2}$ are stronger than they are in pure acetone or in pure $CS_{2}$.

B

The intermolecular forces between acetone and $CS_{2}$ are weaker than they are in pure acetone or in pure $CS_2$.

C

The solution is highly concentrated in $CS_{2}$.

D

Acetone and $CS_{2}$ are both polar liquids.