Fractional Crystallization
Mediumchemistry
Fractional crystallization separates dissolved salts based on:
Select the correct option:
Solution
Incorrect! Answer:
Differences in solubility at given temperature
- Scenario: A mixture of two or more soluble solids in the same solvent.
- Basis: The method utilizes the fact that different substances have different solubilities in the same solvent at the same temperature.
- Process:
- The mixture is dissolved in a solvent to form a saturated solution.
- The solution is cooled or slowly evaporated.
- Mechanism: The less soluble component reaches its saturation point first and begins to precipitate/crystallize out of the solution.
- Separation: The crystals are filtered off, while the more soluble components remain dissolved in the 'mother liquor'. This can be repeated to achieve high purity.
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About This Question
- Subject
- chemistry
- Chapter
- purification techniques
- Topic
- fractional crystallization
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Differences in solubility at given temperature
- Scenario: A mixture of two or more soluble solids in the same solvent.
- Basis: The method utilizes the fact that different substances have different solubilities in the same solvent at the same temperature.
- Process:
- The mixture is dissolved in a solvent to form a saturated solution.
- The solution is cooled or slowly evaporated.
- Mechanism: The less soluble component reaches its saturation point first and begins to precipitate/crystallize out of the solution.
- Separation: The crystals are filtered off, while the more soluble components remain dissolved in the 'mother liquor'. This can be repeated to achieve high purity.
This medium difficulty chemistry question is from the chapter purification techniques, covering the topic of fractional crystallization. It appeared in the 2025 exam.
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