Chapter 26, Problem 26.21QAP

Interpretation Introduction

(a)

Interpretation:

Retention factors for each compound should be calculated.

Concept introduction:

Following equation can be used in calculation of retention factors.

$\begin{array}{l}k=\frac{t_R-t_M}{t_M}\\ \text{where:}\\ \text{k=}\text{Retention}\text{factor}\\ {\text{t}}_{\text{R}}\text{=Retention}\text{time}\text{of}\text{interested}\text{species}\\ {\text{t}}_{\text{M}}\text{=}\text{Migration}\text{time}\text{of}\text{unretained}\text{species}\end{array}$

Interpretation Introduction

(b)

Interpretation:

Distribution constants for each compound should be calculated.

Concept introduction:

The distribution constant can be calculated as follows:

$\begin{array}{l}K=\frac{k{V}_M}{V_s}\\ \text{where:}\\ \text{K=Distribution}\text{constant}\\ \text{k=Retention}\text{factor}\\ {\text{V}}_{\text{S}}\text{=Stationary}\text{phase}\text{volume}\\ {\text{V}}_{\text{M}}\text{=Volume}\text{of}\text{mobile}\text{phase}\end{array}$

Interpretation Introduction

(c)

Interpretation:

Selectivity factor for methylcyclohexane and methylcyclohexene should be calculated.

Concept introduction:

For the calculation of selectivity factor for methylcyclohexane and methylcyclohexene, the following formula will be used:

$\begin{array}{l}\alpha =\frac{{\left(t_R\right)}_B-t_M}{{\left(t_R\right)}_A-t_M}\\ \text{Here,}\\ \text{α=Selectivity}\text{factor}\\ {\left({\text{t}}_{\text{R}}\right)}_{\text{A}}\text{and}{\left({\text{t}}_{\text{R}}\right)}_{\text{B}}\text{=Retention}\text{time}\text{of}\text{substance}\text{A}\text{and}\text{B}\text{respectively}\\ {\text{t}}_{\text{M}}\text{=}\text{Migration}\text{time}\text{of}\text{unretained}\text{species}\end{array}$