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Standard IX

Chemistry

Crystallisation

Which of the ...

Question

Which of the following is not a criterion for choosing a solvent for recrystallization?

The solute should be relatively insoluble in the solvent at room temperature

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The solvent should have a boiling temperature between

40^{o} C

and

120^{o} C

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The solute should be more soluble in the cold solvent than in the hot

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The solvent and solute should be chemically compatible

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Solution

The correct option is C The solute should be more soluble in the cold solvent than in the hot
The option (C) is not a criterion for choosing a solvent for recrystallization. The solute should be more soluble in the hot solvent than in the cold. Due to this, the solute can be dissolved in hot solvent and then solvent can be cooled so that the crystallized solute can be filtered.

Option C is correct.

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