Two liquids (A) and (B) can be separated by the method of fractional distillation. The boiling point of liquid (A) is less than boiling point of liquid (B). Which of the liquids do you expect to come out first in the distillate ? Explain.

Two liquids (A) and (B) can be separated by the method of fractional d

1.	Two liquids (A) and (B) can be separated by the method of fractional distillation. The boiling point of liquid (A) is less than boiling point of liquid (B). Which of the liquids do you expect to come out first in the distillate ? Explain.
Answer» Solution :Fractional distillation is used to SEPARATE the components of a MIXTURE if their boiling points differ by `20^(@)` or less. In this method, a fractionating column is used in between the flask and the condenser. The purpose of the fractionating column is to PROVIDE hurdles for the ascending vapours and to provide large surface area for condensing the high boiling liquid. Consequently, the vapours of the low boiling liquid (A) will move up while those of the high boiling liquid will condense and fall back into the flask. As a result of this FRACTIONATION, liquid A with lower boiling POINT will distil first and liquid B with higher boiling point afterwards.