Question

The crystallization is the better method than evaporation for the separation of the mixture.
A.True
B.False

Answer 1

Hint: To answer this question, you should recall that concept of crystallization. Crystallization is the process used for the purification of solid substances. It is the process of formation of solid crystals of a substance precipitating from a homogeneous solution.

Complete step by step answer:
- Evaporation is considered as the transition from liquid to gas if it takes place at a temperature lower than the boiling point of the liquid, and the process of boiling only occurs at the boiling point, there is no such distinction within the solid-to-gas transition. Crystallisation technique for purification is better than evaporation because:
- The extent of purification in the case of crystallisation technique is very high.
- Crystallisation does not require very high-temperature conditions, there is no need to boil the solvent.
- In evaporation, we allow the solution to heat to make the solvent evaporate but this may degrade the solute into some other compound.
- The technique does not require complex apparatus setup for performing the purification.

Hence, we can conclude that the correct answer to this question is option A.

Note:
You should know about the steps involved in the crystallization Process
-The solution is heated in an open container
-The solvent molecules start evaporating, leaving behind the solutes
-When the solution cools, crystals of solute start accumulating on the surface of the solution
-The undissolved solids in the liquid are separated by the process of filtration
-The size of crystals formed during this process depends on the cooling rate
-Many tiny crystals are formed if the solution is cooled at a fast rate
-Large crystals are formed at slow cooling rates.