Abstract
A mixture of organic compounds may be in the solid or liquid form or may consist of a solid dissolved or suspended in a liquid. If a solid and a liquid are present it is usually unwise to expect separation to be accomplished by filtration because the liquid phase almost certainly contains some dissolved solid and traces of the liquid component may be difficult to remove from the solid compound. The methods of isolating pure samples of the components from a mixture may be either physical or chemical. The physical method consists of fractional distillation and is applicable only if there is a wide difference between the boiling points of the two compounds and provided that an azeo-trope is not formed. The chemical method of separating two compounds depends on their differing solubility in water, ether, dilute acid or alkali.
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