Column Chromatography
Increasing polarity of eluent in column chromatography generally:
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About This Question
- Subject
- chemistry
- Chapter
- purification techniques
- Topic
- column chromatography
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Increases rate of elution for polar compounds
- Stationary Phase: Typically highly polar (e.g., Silica gel or Alumina).
- Adsorption: Polar solutes stick strongly to the stationary phase, while non-polar ones move faster.
- Mobile Phase (Eluent): Its job is to 'carry' the solutes down the column.
- Polarity Effect: A more polar solvent is more competitive. It interacts more strongly with the stationary phase sites, effectively 'displacing' the adsorbates.
- Outcome: Higher eluent polarity reduces the retention of all compounds, especially polar ones, causing them to elute faster (move down the column more quickly).
This medium difficulty chemistry question is from the chapter purification techniques, covering the topic of column chromatography. It appeared in the 2025 exam.
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