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CBSE Class 9 Answered

Apparatus, procedure,observation and conclusion for paper chromatography and crystallization

 

Asked by akshah2407 | 06 Aug, 2019, 06:19: PM
Expert Answer
(1) Paper Chromatography:
 
It is the simplest type of chromatography. In this method, a special type of paper called chromatographic paper or ordinary filter paper is used.
A line is drawn near the bottom edge of the paper. The paper is dipped in a solvent and taken in a beaker so that the line drawn on the paper is above the level of the solvent.
 
Stationary phase: Filter paper
Mobile phase: Solvent
 
 
 
As the solvent rises on the paper, it takes along with it the drop of the substances.
The component of the drop which is more soluble rises faster and we see various spots on the paper, each indicating a component of the mixture.
The paper is then removed from the solvent and dried.
 
 
(2) Crystallisation:
 
This method is based on the differences in the solubility of solids in a liquid.
The process of formation of crystals from a hot saturated solution caused by cooling is called crystallisation. It is a process in which a solution containing more of the solid component is slowly evaporated.
Pure sugar is obtained from its solution in water by the process of crystallisation.
 
Answered by Ramandeep | 07 Aug, 2019, 11:50: AM

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