Question

crystallization is better technique than simple evaporation . give reason

Answer 1

in CRYSTALLIZATION only the pure substance form crystals...

but in the case of evaporation the impure substance can sometimes get evaporated along with the pure one....

Answer 2

1. some solids decompose on heating to dryness.
2.some impurities may remain dissolved in the solution even after filtration.
on evaporation these contaminate the solid

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