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Last updated date: 28th Nov 2023
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MVSAT Dec 2023

Why is crystallization called a physical change?

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Hint: Remember that crystallization is the solidification of atoms/molecules into a structured shape known as a crystal, and that it is a better technique for separating mixtures.

Complete answer:
-The method of crystallization is used to achieve the pure crystallized form of a substance that was previously impure.
-The impure material is dissolved in a solution that is only slightly soluble at room temperature and significantly soluble at high temperatures. The solution is heated to remove all of the material, then filtered to reveal the cooled crystals on the filter paper.
- This process can be reversed by immersing the crystals in a solvent that allows the material to dissolve completely. As a result, crystallization can be reversed.
-Chemical and fundamental shifts are irreversible, as we all know. Crystallization is a natural process that occurs in the absence of biological species. On the other hand, physical changes can be reversed.
As a result, crystallization can be described as a physical change.
No new material is produced during the crystallization process; instead, a larger substance is obtained in its crystal form. A small piece of alum, for example, is hung in an alum solution with a thread to produce a large crystal. After a while, we note that the alum piece has grown in size. This is due to the fact that alum collects small fragments of alum. The chemical composition of alum is unchanged in this phase. As a result, it's a physical change.

Keep in mind that if the compound and the impurities have similar solubilities, purification would require several crystallizations. If a solvent is applied to a newly crystallized material, the solvent will not evaporate, leaving no crystals. To reverse the process, the material would need to be recrystallized.