Chapter 8, Problem 12Q

Interpretation Introduction

Interpretation:

The $R_f$ value for substance B in figure 8.10 should be calculated.

Concept introduction:

The $R_f$ value or the retention factor is defined as the ratio of distance traveled by the spots by the distance traveled by the solvent.

  $R_f=\frac{\text{Distance travelled by spot}}{\text{Distance travelled by solvent}}$

The more the compounds move, the higher is the $R_f$ value. Thus the polarity of the compound helps in deciding the $R_f$ value.