Question

Differentiate between a solution showing positive (+ve) deviation and a solution showing

negative (-ve) deviation from Raoult’s law.​

Answer 1

Answer:

Positive deviation:

• Vapour pressure of the mixture is always higher than vapour pressure calculated from Raoult's law.
• Interaction between the components A and B is weaker than A-A or B-B interaction.
• For example, mixture of water and chloroform show positive deviation.

Negative deviation:

• Vapour pressure of the mixture is always lower than vapour pressure calculated from Raoult's law.
• Force of attraction between A-A and B-B molecules is weaker than A-B.
• For example, a mixture of chloroform and acetone show negative deviation.

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