Question

Some liquids on mixing form 'azeotropes'. What are 'azeotropes'?

Answer 1

Azeotropic solutions are those solutions whose boiling points remain constant. As a result, both components boil at the same temperature, regardless of difference in their respective boiling points.

Thus, binary mixtures that have the same composition in liquid and vapour phase and have constant boiling points are called azeotropes. It is not possible to separate the components of azeotropes by fractional distillation.