Chapter 21, Problem 21.22P

a)

Interpretation Introduction

Interpretation:

The concentration of X in the unknown has to be calculated.

Concept Introduction:

Quantitative analysis with internal standard can be given by the formula of,

$\frac{{\text{A}}_{\text{x}}}{\left[\text{X}\right]}\text{=F}\frac{{\text{A}}_{\text{s}}}{\left[\text{S}\right]}$

Here ${\text{A}}_{\text{x}}$ = area of analyte signal

${\text{A}}_{\text{s}}$ = area of internal standard

$\left[\text{X}\right]$ = analyte’s concentration

$\left[\text{S}\right]$ = concentration of internal standard

$\text{F}$ = response factor

b)

Interpretation Introduction

Interpretation:

The concentration of X has to be calculated if the concentration of S is 3.42 times.

Concept Introduction:

Quantitative analysis with internal standard can be given by the formula of,

$\frac{{\text{A}}_{\text{x}}}{\left[\text{X}\right]}\text{=F}\frac{{\text{A}}_{\text{s}}}{\left[\text{S}\right]}$

Here ${\text{A}}_{\text{x}}$ = area of analyte signal

${\text{A}}_{\text{s}}$ = area of internal standard

$\left[\text{X}\right]$ = analyte’s concentration

$\left[\text{S}\right]$ = concentration of internal standard

$\text{F}$ = response factor