Problems and exercisesDistillation

1. Which distillation?

Give the most suitable type of distillation for:

1. Recovering diethyl ether (b.p. 35 °C) from a solution of a non-volatile solid.
2. Separating hexane (b.p. 69 °C) and heptane (b.p. 98 °C).
3. Purifying a liquid that boils at 280 °C but decomposes above 200 °C.
4. Obtaining the essential oil of lavender.

2. Boiling at a lower temperature

Why does a liquid boil at a lower temperature when the pressure is reduced?