why water cannot be seperated completely from ethyl alcohol by fractional distillation

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Solution

It is not possible to obtain 100 % ethanol from ethanol- water mixture even by fractional distillation. This is due to the fact that ethanol forms azeotropic solution with water at the concentration 95 % by volume.
As soon as this composition is achieved, the vapour and solution exist with same composition and no furthur seperation occurs.

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