Question

why is crystallisation better than evaporation

Answer 1

hey sakna here

Crystallization is better than evaporation in mainly two ways, :  

1. in evaporation, the solution needs to be at the boiling point of the solvent, the whole time. This may degrade the solute.  

2. in crystallization, the crystals automatically throw away impurities to arrange themselves in a regular manner. Therefore, the degree of purity is higher than the solute left after evaporation

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Answer 2

Crystallization is the process that separates the pure solid in the form of its crystals from a solution.
Crystallization is better than evaporation because during evaporation
Some solids decompose or some, like sugar may get charred on heating to dryness.