# Why is benzene separated from water using a separatory funnel?

May 5, 2017

Miscibility & Density difference

#### Explanation:

Benzene and water are partially miscible solvents.If we mix alcohol and water they mix together and form a homogeneous mixture. Separating such mixtures require more energy. Hence we use distillation.

But Benzene and water form a non homogeneous mixture, with very little mixing in the interface.We can just let the mixture stand still for long time. They will separate into 2 layers because of the difference in densities. Top layer will be benzene and the bottom layer will be water. Hence we can separate them using a separating funnel.

May 5, 2017

But it would be inconvenient, and very tedious to do so........the normal boiling points of water and benzene ($80.1$ ""^@C) are not all that different, and when you heated them up, I suspect that you would form an azeotrope. And if there were two phases, distillation would cause a lot of bumping in the distillation flask.