# (a) Interpretation: Retention factors for each component should be calculated. Concept introduction: The retention factor can be calculated as follows: k = t R − t M t M where: k= Retention factor t R =Retention time of interested species t M = Migration time of unretained species

### Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213

### Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213

#### Solutions

Chapter 27, Problem 27.23QAP
Interpretation Introduction

## (a)Interpretation:Retention factors for each component should be calculated.Concept introduction:The retention factor can be calculated as follows:k=tR−tMtMwhere:k= Retention factortR=Retention time of interested species tM= Migration time of unretained species

Interpretation Introduction

### (b)Interpretation:Selectivity factor for methyl acetate and methyl propionate and methyl propionate and n-butyrate should be calculated.Concept introduction:Selectivity factor can be calculated as follows:Methyl acetate and methyl propionate.Methyl propionate and n-butyrate.α=(tR)B−tM(tR)A−tMwhere:a=Selectivity factor(tR)Aand (tR)B=Retention time of substance A and B respectivelytM= Migration time of unretained species

Interpretation Introduction

### (c)Interpretation:Average plate number and plate height should be calculated.Concept introduction:Number of theoretical plates can be calculated as follows:N=16(tRW)2where:N=Number of platestR=Retention timeW=Width of peak basePlate height can be calculated using following equation.H=LNwhere:H=Plate heightL=Length of column packingN=Number of plates

Interpretation Introduction

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