(a) Interpretation: The formula of the complex should be determined. Concept introduction: Slope-ratio method is used for weak complexes, x M + y L ⇌ M x L y When L is in excess, C M = x [ M x L y ] A 1 = ε l [ M x L y ] = ε l C M x When M is in excess, C L = y [ M x L y ] A 2 = ε l [ M x L y ] = ε l C L y Therefore slope of the plot of absorbance versus concentration of M or L gives ε l x or ε l y respectively. The ratio of the two slope will give the combining ratio of M and L. ε l / x ε l / y = y x

BuyFind

Principles of Instrumental Analysis

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

Principles of Instrumental Analysis

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

Solutions

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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