Quantitative Chemical Analysis
Quantitative Chemical Analysis
9th Edition
ISBN: 9781464135385
Author: Daniel C. Harris
Publisher: W. H. Freeman
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Chapter 24, Problem 24.29P
Interpretation Introduction

Interpretation:

The retention index of the unknown has to be calculated.

Concept Introduction:

Kovats retention index:

Retention index, I for linear alkane equals 100 times the number of Carbon atoms.

For a molecule of Octane, I=800

For a molecule of Nonane, I=900

The elution of compound between Octane and Nonane will have retention index between 800 and 900 is calculated using the formula,

I=100[n+(N-n)logtr'(unknown)-logtr'(n)logtr'(N)-logtr'(n)]

Where, n = number of Carbon atoms in smaller alkane

N = number of Carbon atoms in larger alkane

tr'(n) = adjusted retention time of smaller alkane

tr'(N) = adjusted retention time of larger alkane

To calculate the retention index of the unknown

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