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A compound is soluble in ether at room temperature but not very soluble at -80°C ("dry...

A compound is soluble in ether at room temperature but not very soluble at -80°C ("dry ice" temperature). Would ether be a useful crystallization solvent for the compound? Explain.

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Answer #1

Purifying of a coumpound by recrystallization is to first find a suitable solvent. One of the important property that you should look for in a good solvent for recrystallization.

The compound should be very soluble by heating the solvent or soluble in the solvent at room temperature.

The compound should be insoluble or sparingly soluble by decresing the solvent temperature.

This difference in solubility at hot versus cold temperatures is essential for the recrystallization process.

If the compound is very soluble in the solvent at room temperature, then getting the compound to crystallize in pure form, from solution is requires significantly lower temperature than the room temperature.

Hence, ether be a useful crystallization solvent for the compound.

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