Question

3.
calculate the $r_f$ value for sample a using the diagram below.
figure 1.

Explanation:

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

The formula for the \(R_f\) (retention - factor) value is \(R_f=\frac{\text{distance traveled by the solute}}{\text{distance traveled by the solvent}}\)

Step2: Identify the values from the diagram

From the diagram, for Sample A:

• The distance traveled by the solute (Sample A) \(d_{solute}=4.8\space cm\)
• The distance traveled by the solvent \(d_{solvent}=6.8\space cm\)

Step3: Calculate the \(R_f\) value

Substitute the values into the formula:
\(R_f=\frac{4.8}{6.8}\approx0.71\)

Answer:

The \(R_f\) value for Sample A is approximately \(0.71\)