Quantitative Chemical Analysis
Quantitative Chemical Analysis
9th Edition
ISBN: 9781464135385
Author: Daniel C. Harris
Publisher: W. H. Freeman
Question
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Chapter 23, Problem 23.28P

(a)

Interpretation Introduction

Interpretation:

From the columns given, the column with highest number of plates has to be identified.

Concept introduction:

Plates of column:

The relationship between Nandw1/2

N=5.55tr2w1/22Where,N-numberofplatesoncolumntr-retentiontimew1/2-half-width

(a)

Expert Solution
Check Mark

Answer to Problem 23.28P

  • The column with highest number of plates is Column2.

Explanation of Solution

Given information,

Column1:N=1000;k2=1.2;α=1.16;resolution=0.6Column2:N=5000;k2=3.9;α=1.06;resolution=0.8Column3:N=500;k2=4.7;α=1.31;resolution=1.1Column4:N=2000;k2=2.4;α=1.24;resolution=1.5

Form the given columns, column 2 has the highest number of plates N=5000.

The column with highest number of plates is Column2.

(b)

Interpretation Introduction

Interpretation:

From the columns given, the column with greatest retention has to be identified.

Concept introduction:

Retention factor:

The retention factor (k) is given by

k=tr-tmtmWhere,k-retentionfactortr-timerequiredtoelutethepeaktm-timerequiredformobilephasetopassthroughthecolumn.

(b)

Expert Solution
Check Mark

Answer to Problem 23.28P

  • The column with greatest retention is Column3.

Explanation of Solution

Given information,

Column1:N=1000;k2=1.2;α=1.16;resolution=0.6Column2:N=5000;k2=3.9;α=1.06;resolution=0.8Column3:N=500;k2=4.7;α=1.31;resolution=1.1Column4:N=2000;k2=2.4;α=1.24;resolution=1.5

Form the given columns, column 3 has the greatest retention k2=4.7.

The column with greatest retention is Column3.

(c)

Interpretation Introduction

Interpretation:

From the columns given, the column with highest relative retention has to be identified.

Concept introduction:

Relative retention:

The ratio of the adjusted retention time of two components is given by relative retention α

α=tr'2tr'1Where,α-relativeretention(alsocalledseparationfactor)tr'2-adjustedretentiontimeofcomponent2tr'1-adjustedretentiontimeofcomponent1Theseparationbetweenthetwocomponentwillbehigherwhentr'2>tr'1,soα>1

(c)

Expert Solution
Check Mark

Answer to Problem 23.28P

  • The column with highest relative retention is Column3.

Explanation of Solution

Given information,

Column1:N=1000;k2=1.2;α=1.16;resolution=0.6Column2:N=5000;k2=3.9;α=1.06;resolution=0.8Column3:N=500;k2=4.7;α=1.31;resolution=1.1Column4:N=2000;k2=2.4;α=1.24;resolution=1.5

Form the given columns, column 3 has the highest relative retention α=1.31.

The column with highest relative retention is Column3.

(d)

Interpretation Introduction

Interpretation:

From the columns given, the column with best separation has to be identified.

Concept introduction:

Purnell equation:

The relationship between Handα is given by Purnell equation,

Resolution=N4(α-1)α(k21+k2)Where,N-numberoftheoreticalplatesα-relativeretentionofthetwopeaksk2-retentionfactorofthemoreretainedcomponent

(d)

Expert Solution
Check Mark

Answer to Problem 23.28P

  • The column with best separation is Column4.

Explanation of Solution

Given information,

Column1:N=1000;k2=1.2;α=1.16;resolution=0.6Column2:N=5000;k2=3.9;α=1.06;resolution=0.8Column3:N=500;k2=4.7;α=1.31;resolution=1.1Column4:N=2000;k2=2.4;α=1.24;resolution=1.5

Form the given columns, column 4 has the best separation Resolution=1.5.

The column with best separation is Column4.

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