Principles of Instrumental Analysis
Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Chapter 14, Problem 14.17QAP
Interpretation Introduction

(a)

Interpretation:

The formula of the complex should be determined.

Concept introduction:

Slope-ratio method is used for weak complexes,

xM + y MxLy

When L is in excess, CM=x[MxLy]

A1=εl[MxLy]=εlCMx

When M is in excess, CL=y[MxLy]

A2=εl[MxLy]=εlCLy

Therefore slope of the plot of absorbance versus concentration of M or L gives εlx or εly respectively.

The ratio of the two slope will give the combining ratio of M and L.

εl/xεl/y=yx

Interpretation Introduction

(b)

Interpretation:

The molar absorptivity of the complex and its uncertainty should be determined.

Concept introduction:

Slope-ratio method is used for weak complexes,

xM + y MxLy

When L is in excess, CM=x[MxLy]

A1=εl[MxLy]=εlCMx

When M is in excess, CL=y[MxLy]

A2=εl[MxLy]=εlCLy

Therefore slope of the plot of absorbance versus concentration of M or L gives εlx or εly respectively.

The ratio of the two slope will give the combining ratio of M and L.

εl/xεl/y=yx

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