Distillation Principle
Easychemistry
Fractional distillation is preferred over simple distillation when:
Select the correct option:
Solution
Incorrect! Answer:
Boiling points differ by <25°C
- Simple Distillation: Used to separate a volatile liquid from a non-volatile impurity or two liquids with a large boiling point difference (typically >402˘01350∘C).
- Fractional Distillation: Used when the boiling point difference between two miscible liquids is small (less than 25∘C or 25K).
- Equipment: It utilizes a fractionating column packed with glass beads or other surface-enhancing materials.
- Mechanism: The column provides a large surface area for repeated condensation and vaporization. As the vapors rise, they become richer in the more volatile component.
- Efficiency: Each step on the column acts like a several 'mini-distillations', allowing for the separation of components that would otherwise distill together in a simple setup.
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About This Question
- Subject
- chemistry
- Chapter
- purification techniques
- Topic
- distillation principle
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Boiling points differ by <25°C
- Simple Distillation: Used to separate a volatile liquid from a non-volatile impurity or two liquids with a large boiling point difference (typically >402˘01350∘C).
- Fractional Distillation: Used when the boiling point difference between two miscible liquids is small (less than 25∘C or 25K).
- Equipment: It utilizes a fractionating column packed with glass beads or other surface-enhancing materials.
- Mechanism: The column provides a large surface area for repeated condensation and vaporization. As the vapors rise, they become richer in the more volatile component.
- Efficiency: Each step on the column acts like a several 'mini-distillations', allowing for the separation of components that would otherwise distill together in a simple setup.
This easy difficulty chemistry question is from the chapter purification techniques, covering the topic of distillation principle. It appeared in the 2025 exam.
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