Chromatography
In thin-layer chromatography (TLC), the Rf value of a compound is defined as:
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About This Question
- Subject
- chemistry
- Chapter
- purification techniques
- Topic
- chromatography
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Distance traveled by spot / distance by solvent front
- Definition: Rf stands for Retardation Factor.
- Measurement: It is a dimensionless ratio calculated from the chromatogram.
- Formula: Rf=Distance traveled by the solvent front from baselineDistance traveled by the substance from baseline.
- Range: Since the solute can never move faster than the solvent, the Rf value is always less than 1 (0≤Rf≤1).
- Utility: Rf values are characteristic for a compound with a specific stationary phase and solvent system, allowing for the identification of components in a mixture.
This easy difficulty chemistry question is from the chapter purification techniques, covering the topic of chromatography. It appeared in the 2025 exam.
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