Give one example each of miscible liquid pairs showing positive and negative deviations from Raoult’s law. Give reason for such deviation.

The deviation from the ideal behavior is due to the difference between the interactions between the solute and solvent particles.

Positive deviation:- The solution of n-hexane and ethanol shows the positive deviation because the Hydrogen bonding in case of ethanol is decreased by the n-hexane molecules. Due to decreased attraction the vapour pressure of the mixture increases leading to positive deviation.

Negative deviation:- Solution of acetone and chloroform shows negative  deviation because it forms Hydrogen bonding between the molecules.  Due to this the vapour pressure of the mixture decreases leading to the negative deviation.

Published by Ankush Sharma

I am M.Sc (chemistry ) from Punjabi University Patiala. I am a science teacher with expertise in chemistry, with 8 years of experience in teaching. Writing and blogging is my hobby, I write whenever I am free. I am constantly working on creating a new and easy way of learning the tough things in an effective way. I am constantly working to make authentic and reliable information to be shared with my students and widen the horizons of knowledge.

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