ANS :- Crystallization is better than evaporation because ~
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》 In evaporation, the solution needs to be boiled, but crystallization does no require very high temperature. A high temperature can degrade the solute. 

×[ EXPLANATION ]×

High temperature or (boiling) KILLS the quality of the substance { SOLUTE }. _________________________________


》In crystallization, the extent of purification is higher 
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Why Crystallization is Better than Evaporation

Introduction:
Crystallization and evaporation are both methods used to separate solute substances from a solvent. However, crystallization is generally considered a more advantageous technique compared to evaporation due to several reasons. This article explores why crystallization is better than evaporation in detail.

1. Efficiency:
Crystallization is a more efficient process for separating solutes because it allows for the recovery of a higher percentage of the desired substance compared to evaporation. During crystallization, the solute is selectively separated from the solvent by forming crystals, which can be easily filtered or centrifuged to obtain a purer product. In contrast, evaporation involves the removal of the solvent by heating, leaving behind the solute as a residue. However, evaporation can lead to loss of the solute due to its volatility or degradation under high temperatures.

2. Purity:
Crystallization offers a higher degree of purity compared to evaporation. When a solute crystallizes, impurities are often excluded from the crystal lattice, resulting in a purer product. On the other hand, evaporation may leave behind impurities mixed with the solute, which can affect the quality and properties of the final product. Crystallization allows for the growth of well-defined crystals with a regular arrangement of molecules, ensuring a higher level of purity.

3. Control over Crystal Size and Shape:
Crystallization provides better control over the size and shape of crystals formed. By adjusting parameters such as temperature, cooling rate, and concentration, it is possible to influence the crystal growth process. This control allows for the production of crystals with specific characteristics, which can be advantageous in various applications. In contrast, evaporation does not offer the same level of control, resulting in the formation of irregular shapes and sizes.

4. Selectivity:
Crystallization offers selectivity in separating different components of a mixture based on their solubility. By manipulating the conditions, it is possible to selectively crystallize one component while leaving others in the solution. This selectivity allows for the separation of complex mixtures and the isolation of specific compounds. Evaporation, on the other hand, does not provide the same level of selectivity, as it primarily relies on the volatility of the solute.

Conclusion:
In summary, crystallization is a superior technique compared to evaporation due to its efficiency, purity, control over crystal size and shape, and selectivity. It allows for the recovery of a higher percentage of the desired substance, produces purer products, offers control over crystal characteristics, and enables the selective separation of components. These advantages make crystallization a preferred method in various industries such as pharmaceuticals, chemicals, and food processing.