INSTRUMENTAL ANALYSIS-ACCESS >CUSTOM<
INSTRUMENTAL ANALYSIS-ACCESS >CUSTOM<
7th Edition
ISBN: 9781337783439
Author: Skoog
Publisher: CENGAGE C
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Chapter 14, Problem 14.23QAP
Interpretation Introduction

(a)

Interpretation:

The formation constant and the difference in molar absorptivities at 470 nm should be determined using linear regression and the Benesi-Hildebrand equation.

Concept introduction:

The Benesi-Hildebrand equation is:

bΔA=1ΔεKfCM.1CL+1ΔεCM

b − length of the solution light passes through

ΔA − difference between absorbance with and without the ligand present

Δe − difference of the molar absorptivities of complex and metal ion.

Kf − formation constant

CM − concentration of metal ion

CL − concentration of ligand.

Interpretation Introduction

(b)

Interpretation:

The values of Kf and Δe should be determined using non-linear regression.

Concept introduction:

ΔAb=ΔεKfCLCM1+KfCL

b − length of the solution light passes through

ΔA − difference between absorbance with and without the ligand present

Δe − difference of the molar absorptivities of complex and metal ion.

Kf − formation constant

CM − concentration of metal ion

CL − concentration of ligand.

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