How will you separate a mixture containing kerosene and petrol (difference in their boiling points is more than 25°C), which are miscible with each other?

Ans. To separate a mixture containing kerosene and petrol which are miscible with each other, fractional distillation process is employed.

1. Take a mixture of kerosene and petrol in a distillation flask and heat it on a low flame.

2. The petrol has lower boiling point than kerosene. It vaporises early as compared to kerosene. When the vapours of petrol and kerosene are passed into fractionating column, the kerosene in the form of liquid (after condensation) flows back in the distillation flask.

3. When the temperature starts rising, the receiver is replaced by another receiver to collect the kerosene.

4. The vapours of petrol pass into Liebig’s condenser, these vapours get liquefied and flow into receiver.

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