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  • 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 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.

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The two liquids which we are considering above does not have much difference in their boiling points, and so simple distillation cannot just be used for the separation process. So the technique of fractional distillation is used in very such cases, which is a technique where vapours of a liquid mixture are passed through a fractionating column before condensation and the column used for fractionating is fitted over the mouth of the round bottom flask and the liquid with low boiling point distils first.

When vapours of a liquid mixture are passed through a fractionating column, the capours of the low boiling liquid (A) will move up while those of the high boiling liquid will condense and fall back into the flask. Therefore, liquid (A) with low boiling point will distill first.

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