Theory:

Evaporation is used to separate the substance from the solvent or to obtain concentrated solutions.
Evaporation is used to obtain thermally unstable substances by heat to boiling point of the substance.
  
Remember that the evaporation is carried out in a porcelain bowl or beaker.
  
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Example:
In the process of evaporation we can purify common salt from water.
In organic chemistry, a rotary evaporator is used to separate the mixture from the solvent.
 
In a rotary evaporator, the solvent is usually removed from the mixture under reduced pressure, which lowers the boiling point of the solvent and makes it much easier to evaporate. Organic solvents can easily ignite, so the mixture is heated in a water bath.
 
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Pictured: Rotary evaporator.
Example:
Rotary evaporator can separate the caffeine from the acetone.