Question

Amit was asked by his teacher to separate a liquid mixture of acetone and ethyl alcohol. He set up a

distillation apparatus and tried to distil the mixture. To his surprise, both the liquids got distilled.

Teacher told Amit to repeat the experiment by using a fractionating column in the distillation flask.

Amit followed the advice of the teacher and he was able to separate the two liquids.


(a) Why was Amit not successful in separating the liquid mixture earlier?


(b) Why did teacher ask him to use the fractionating column?​

Answer 1

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Answer 2

Fractional Distillation helps us to separate two liquids with close boiling points.

Explanation:

(a)

Amit was unable to separate acetone and ethyl alcohol through simple distillation apparatus because both of the liquid boiling points are similar. The boiling point of acetone is 56 degree Celsius whereas ethyl alcohol is 78.37 degrees Celsius.

(b)

The teacher suggested him to perform fractional distillation using a fractionating column because it can separate two immiscible liquids. According to the principles of fractional distillation, both the liquid(acetone and ethyl alcohol) will boil and evaporate at different temperatures.