Question

Using the provided information in paper chromatography

The calculated $R_f$ value of A is __________ $\times 10^{-1}$.

Hint:

The $R_f$ value is always less than or equal to 1. It is a characteristic property of a compound for a specific solvent-adsorbent pair.

Answer 1

Correct Answer: 4

The R_f value in paper chromatography is calculated using the formula:

R_f =   ^{Distance traveled by the substance}⁄_{Distance traveled by the solvent front}

From the image, the distance traveled by substance A is 2 cm, and the distance traveled by the solvent front is 5 cm. Thus:

R_f =   ^{2 cm}⁄_{5 cm} = 0.4

Therefore, the calculated R_f value of A is 4×10^-1.

This value is within the expected range of 4,4, confirming the result.