Question

What is Crystallization ?Where is it used ? Why is this better than simple Evaporation technique?

(Answer in a way that if it comes for 3 marks )

Answer 1

efinition: Crystallisation is the process that separates a pure solid in the form of its crystal from a solution. This method is used to purify solids.

Use: The salt we get from seawater has many impurities in it. The crystallisation method is used to remove these impurities.

Reasons for being better than simple evaporation: 1. The process of evaporation gives residue which may contain impurities. When there is requirement to obtain solid without impurity, crystallisation method is preferred.

2. In general practice, impure solids are obtained by evaporation and are further purified by crystallisation. e.g. salt obtained from sea is further purified by this method.

3. In some cases e.g. sugar crystal cannot be obtained by simple evaporation technique because sugar gets charred on heating to dryness. In such cases, crystallisation technique is applied.

Hope this will help

Answer 2

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Here is your answer==>>>


Crystallization is the process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal. Some of the ways by which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas

Evaporation is the process by which the solvent is converted into vapor, leaving the solute component behind.Evaporation is a heat absorbing process requiring energy to take place. ... Generally, crystallization would bebetter when a solution is saturated but would be less effective if the solution is dilute.


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