Mention the utility of Crystallisation. Why do you call it a physical change.
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The main use of crystallization in the organic chemistry laboratory is for purification of impure solids: either reagents that have degraded over time, or impure solid products from a chemical reaction. ... If the crude product of a chemical reaction is a solid, it may be crystallized in order to remove impurities.
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crystallization is a natural process which occurs as material solidify from a liquid, or as they precipitate out of a liquid or gas. This can be caused by a physical change, such as a temperature change, or a chemical change such as acidity.
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