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In the recrystallization of p-dibromobenzene, why does the solution eventually turn cloudy upon addition of water?

In the recrystallization of p-dibromobenzene, why does the solution eventually turn cloudy upon addition of water?

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Answer #1

In the recrystallization process water-ethanol mixture is used.

We know that polar compound dissolve in polar solvent and nonpolar dissolves in nonpolar solvents. But for recrystallization mixed solvents which are miscible in each other are used.

During recrystallization of p-dibromobenzene when water is added to solution hydration shells are formed as our solute (in our case p-dibromobenzene) is not soluble in water at room temperature.

Even though water-ethanol are miscible, hydration/solvation shells will form due to p-dibromobenzene and they appear as if it cloudy.

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