Question

Which type of mixtures are separated using distillation method? If the difference in boiling points of constituents is less than 25K then which method will you adopt? Give an example where this method is used for separation

Answer 1

Distillation is a process employed to obtain pure liquid from its solution. It can be defined as the conversion of impure liquid into vapours by evaporation and then condensation of the vapours to get pure liquid. 

This method is generally used for the separation of components of a mixture containing two miscible liquids that boil without decomposition and their boiling points are quite different (more than 25- 30°C).


Fractional distillation is used to separate mixture having less than 25k.

Fractional distillation is the separation of amixture into its component parts, or fractions.Chemical compounds are separated by heating them to a temperature at which one or more fractions of the mixture will vaporize. It uses distillation to fractionate. Generally the component parts have boiling points that differ by less than 25 °C from each other under a pressure of one atmosphere. If the difference in boiling points is greater than 25 °C, a simple distillation is typically used.

Answer 2

Which type of mixtures are separated using distillation method? If the difference in boiling points of constituents is less than 25K then which method will you adopt? Give an example where this method is used for separation