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Pharmaceutical Analysis
book

Pharmaceutical Analysis

by P. D. Chaithanya Sudha
July 2012
Intermediate to advanced content levelIntermediate to advanced
758 pages
17h 12m
English
Pearson India
Content preview from Pharmaceutical Analysis

Chapter 5

Complexometry

INTRODUCTION

Werner first observed that each atom is surrounded by the maximum number of small which is collectively called as complex. The technique involves the titrating the metal ions with complexing agent which is commonly known as the ligands. The formed coloured complex is used to detect the end point of the titration.

PRINCIPLE

The main principle is the reaction between the ligand and the metal ion to form a complex. The metal ion acts as Lewis acid and the ligand acts as Lewis base which is the complexing agent:

 

M+2 + Ln Image (MLn)+2

 

  Examples: Ag+ + 2CN Ag(CN)2
Cu+2 + 4NH3 Cu(NH3)4+2
Metal ion ...
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Publisher Resources

ISBN: 9789332515659