Azeotropes
Minimum boiling azeotrope shows which deviation?
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About This Question
- Subject
- chemistry
- Chapter
- solutions
- Topic
- azeotropes
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Positive deviation
- Boiling Point Logic: A liquid boils when its vapor pressure equals atmospheric pressure.
- Minimum Boiling point: Implies that the solution reaches atmospheric pressure at a lower temperature than either pure component.
- High Vapor Pressure: This means the total vapor pressure of the mixture is higher than predicted by Raoult's Law.
- Link to Deviations: High vapor pressure is the definition of a positive deviation (A…B interactions are weaker).
- Example: Mixture of Ethanol (BP≈78.4∘C) and Water (BP=100∘C). The azeotrope boils at 78.2∘C.
This medium difficulty chemistry question is from the chapter solutions, covering the topic of azeotropes. It appeared in the 2025 exam.
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