Question

Q. Why is it not possible to obtain pure ethanol by fractional distillation? What

general name is given to binary mixtures which show deviation from Raoult’s

law and whose components cannot be separated by fractional distillation.

How many types of such mixtures are there?​

Answer 1

Answer:

1. No, because water and ethanol form what is called an azeotrope. In an azeotrope, the ratio of the liquids is such that distillation cannot separate them, but they boil off together. It made possible upto an extent but another technique is also needed.

2. Binary mixture which shows deviation form raoults law and which cannot be separated by fraction distillation are known as azeotropes.

3. There are two main types of mixtures: homogeneous mixtures and heterogeneous mixtures.