Crystallisation

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For efficient recrystallisation of an organic solid, the most suitable solvent should:

Select the correct option:

Dissolve the solute equally well at all temperatures

Dissolve impurities only at low temperature

Dissolve the solute well at high temperature but sparingly at low temperature

React slowly with the solute to form crystals

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About This Question

Subject: chemistry
Chapter: purification and characterisation of organic compounds
Topic: crystallisation
Difficulty: Easy
Year: 2025

Solution

Correct Answer:

Dissolve the solute well at high temperature but sparingly at low temperature

In recrystallisation, the impure solid is dissolved in minimum hot solvent and then cooled. Good crystal recovery needs high solubility of solute in hot solvent and low solubility in cold solvent. This allows pure crystals to separate on cooling while many impurities remain in mother liquor.

This easy difficulty chemistry question is from the chapter purification and characterisation of organic compounds, covering the topic of crystallisation. It appeared in the 2025 exam.

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