Crystallization


 
 
Concept Explanation
 

Crystallization

The process of evaporation gives only the residue which may contain some impurities. To obtain the solid free from impurities the method of crystallization is used. For this, the solution is taken in a china dish and evaporated on a water bath till the solution becomes saturated. To check whether the saturation point has reached or not, take some solution on a glass rod and cool it. At the point of saturation, solid particles in regular and definite shape begin to appear. These particles are called crystals.

The saturated solution is removed from the flame and allowed to cool to the room temperature. The crystals of the solid separate from the solution. The process is called crystallization. The crystals are then filtered out. Thus, the process by which a pure solid in the form of crystals separates from a solution is called crystallization. Hence, the process of crystallization is used to purify solids.

Application of Crystallization:

  • Salt obtained from sea water contains many impurities. These impurities can be removed by crystallization.
  • Impure samples of potash alum (phitkari) and copper sulphate can be purified by this method.
  • In the pharmaceutical industry, crystallization is used as a separation and purification process for the synthesis and isolation of co - crystals. pure active pharmaceutical ingredients etc.
  • Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    Which of the following objects is not a part of the apparatus used for crystallisation?

    Right Option : A
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    Explanation
    Question : 2

    Which of the following techniques is used to obtain pure crystals of alum?

    Right Option : C
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    Explanation
    Question : 3

    Choose correct sequence of the process used for obtaining salt from sea water ?

    Right Option : A
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    Explanation
     
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