Question

If we will separate a mixture of kerosene and petrol by the method distillation. Why don't petrol or kerosene will catch fire?

Answer 1

: kerosene and petrol are miscible liquids also the difference between their boiling point is more than 25 ºC so they can be separated by the method of distillation. Follow the steps given below
(i) Take a mixture in the distillation flask fit it with the thermometer.
(ii) Arrange the apparatus as shown in the given figure.
(iii) Heat the mixture slowly keeping a close watch on thermometer.
(iv) Since the petrol has lower boiling point starts vaporises and condenses in the condenser which is finally collected in the beaker.




Heat is not directly supplied to the mixture ,there is no chance for catching a fire . moreover the amount of heat supplied is just to vapourise petrol from the mixture.This amount of heat is not enough to catch fire.