Question

1. calculate the $r_{f}$ value for sample b using the diagram below.

Explanation:

Step1: Recall the formula for \(R_f\) value

The formula for \(R_f\) (Retention - factor) is \(R_f=\frac{\text{Distance traveled by the sample}}{\text{Distance traveled by the solvent}}\).

Step2: Identify the values from the diagram

For Sample B, the distance traveled by the sample is \(2.8\space cm\), and the distance traveled by the solvent is \(5.0\space cm\).

Step3: Calculate the \(R_f\) value

Substitute the values into the formula: \(R_f=\frac{2.8}{5.0}\).

Answer:

\(0.56\)