Question:
Using the provided information in the following paper chromatogram:
Fig: Paper chromatography for compounds A and B
The calculated $R_{f}$ value of $A$ ________________ $\times 10^{-1}$
Solution:
(4)
$\mathrm{R}_{\mathrm{f}}=\frac{\text { Dis tan ce travelledby compound }}{\text { Dis tan ce travelled by solvent }}$
On chromatogram distance travelled by compound is $\rightarrow 2 \mathrm{~cm}$
Distance travelled by solvent $=5 \mathrm{~cm}$
So $\mathrm{R}_{\mathrm{f}}=\frac{2}{5}=4 \times 10^{-1}=0.4$
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