Answer:
Simple distillation is applied only for
volatile liquids which boil without decomposition at atmospheric pressure and
contain non-volatile impurities.
The distillation
under reduced pressure or vacuum distillation is used for those compounds which
decomposes at a temperature below their normal boiling points; such compounds
cannot be purified by simple distillation. Glycerine is the example of a liquid
which decomposes before it boils.
Steam distillation is a co-distillation with water and is carried
out when a solid or liquid practically insoluble in water, is steam volatile.
Steam distillation is based on Dalton's law of partial pressures.
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