write the short note on the folowing purification method with suitable examples
1) Distillation 2) sublimation
- Distillation
Distillation is the method of getting a pure liquid from a solution by evaporation and then condensing the vapour of the liquid having a low boiling point.
When a solution is heated, the liquid component of the mixture evaporates in the form of vapour. The vapour then recondenses into the liquid form which is pure and is called a distillate.
The advantage of this method is that both components of the solid-liquid mixture are obtained.
Example: Distillation of sea water to give pure water in the laboratory
- Sublimation
The process in which a solid change directly into its vapour on heating is called sublimation.
This method is based on the difference between the sublimable and non-sublimable nature of solids. The mixture of sublimable and non-sublimable substances is heated in an evaporating dish covered with an inverted funnel.
Example: Separation of ammonium chloride from sodium chloride in the laboratory
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