why ideal solution do not form azeotrope ?

Azeotropes are defined as those liquid mixtures whose composition in liquid and vapour phase remains same and hence, cannot be separated by using distillation method.Their mixture can either have a higher boiling point than either of the components or they can have a lower boiling point than either of the components.
Point to be noted here that we cannot get azeotrope by mixing two such liquid which form ideal solution upon mixing.Let me explain this.
When you mix any two substances, it is not possible to obtain a complete mixing of the two substances perfectly without formation of new bonds or destruction of old bonds between constituent particles. That can only happen if the substance added is the same as the substance present, in which case it is not called a solution. If you mix one mole of water with another mole of water, technically you get an ideal solution, but water with water is actually not called a solution in the first place, so an ideal solution is not exactly possible when we add two different types of liquid and azeotrpe is formed by mixing two different liquids only.
So, ideal solution do not form azeotrope.

 

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