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describe comprehensively with diagram illustration the negative deviation of solutions from ideal behavior?

describe comprehensively with diagram illustration the negative deviation of solutions from ideal behavior?

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For understanding the negative behavior of solutions from ideal let us take an example of binary solution which has components A and B. If the force of attraction between molecular of A and B in the solution are stronger  than that of between  A — A and B — B, then the tendency of escaping of molecules A—B from the solution becomes less than that of pure liquids. The total pressure of the solution will be lower than the corresponding vapour pressure of ideal solution of the same component  A and B. This type of solution shows negative deviation from Raoult's law.
The negative deviation  of solution have been shown in figure. Some energy released when we mix both solutions. This reaction is exothermic reaction.

Here

ΔHmix = −ve

ΔVmix = −ve

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