Chapter 21, Problem 21.8P

(a)

Interpretation Introduction

Interpretation:

Number of theoretical plates that can produce a peak that elutes at $12.83\text{ min}$ has to be calculated.

Concept Introduction:

Expression to compute number of theoretical plate is as follows:

  $N=\frac{5.55t_{\text{r}}{}^2}{w_{1/2}^2}$

Here,

$t_{\text{r}}$ denotes analyte’s  retention time.

$w_{1/2}$ denotes peak width at half-height.

$N$ denotes number of theoretical plate.

(b)

Interpretation Introduction

Interpretation:

Plate height has to be calculated.

Concept Introduction:

Expression to compute plate height is as follows:

  $H=\frac{L}{N}$

Here,

$t_{\text{r}}$ denotes analyte’s  retention time.

$w_{1/2}$ denotes peak width at half-height.

$N$ denotes number of theoretical plate.

$L$ denotes length of chromatographic column.

$H$ denotes plate height.