Question

Which among the following purification methods is based on the principle of “Solubility” in two different solvents?

• A. Column Chromatography
• B. Sublimation
• C. Differential Extraction
• D. Distillation

Answer 1

Answer: (C)

Differential Extraction

Answer 2

Differential extraction is a technique used to separate components of a mixture based on their different solubilities in two immiscible solvents. This method takes advantage of the differing affinities of the components for the solvents to achieve separation.

Explanation of Differential Extraction: In this method, a mixture is dissolved in a solvent where one component is more soluble than the others. When a second solvent that does not mix with the first is added, the less soluble components will preferentially move into the second solvent. This separation can be repeated several times to improve purity.

Comparison with Other Methods:

• Column Chromatography: Uses a stationary phase and a mobile phase for separation based on different interactions, not solely solubility.
• Sublimation: Involves phase change from solid to gas and back to solid, not based on solubility.
• Distillation: Separates components based on differences in boiling points, not solubility.

Thus, the correct answer is: Differential Extraction