What technique can be employed to get back the acetone

While diluting a solution of salt in

water, a student by mistake added acetone (boiling point 56°C). What technique can be employed to get

back the acetone? Justify your choice. 

Answer: Since, the boiling point of acetone is 56°C and boiling point of water is 100°C, and for distillation the minimum difference in temperature

should be 250°C. Thus by the process of distillation acetone can be separated.