Question
Write a short note on Rf value.
✓
Answer
i. In chromatography, migration of the solute relative to the solvent front gives an idea about the relative retention of the solutes (or components of t the mixture) on the stationary phase.
ii. The relative adsorption of solutes is expressed in terms of its Rf value.
The symbol Rf stands for Retardation Factor.
$\therefore \quad \mathrm{R}_{\mathrm{f}}=\frac{\text { Distance travelled by the solute from the base line }}{\text { Distance travelled by the solvent from the base line }}$
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