北京大学分析化学04络合.pdf

Part IV Complexation Reactions and Titration 4.1 Introduction 4.2 Complexation Equilibria 4.3 Principle for Complexation Titration 4.4 Selective Titration 4.5 Application of Complexation Titration What Are We Going to Learn in This Chapter? The forms and reactions that a metal ion may take The “real” formation constant of complexation real Conditional Constant Conditional Constant Side reaction coefficient - An alternative approach to tackle chemical Side reaction coefficient - An alternative approach to tackle chemical equilibria equilibria Complexation titration curve, Metallochrome indicator, and estimation of titration errors Selectively titration of one type metal ion in a mixture of several types of metal ions Ways of complexation titration and application Recommended Reference Books • Anders Ringbom. Complexation in Analytical Chemistry -A Guide for the Critical Selection of Analytical Methods Based on Complexation Reactions. InterScience Publishers, a Division of John WileySons, 1963. • A. 林邦著，戴明译，杨麒校. 分析化学中的络 合作用. 高等教育出版社, 1987. 4.1 Introduction –Inorganic Ligands 2+ 2+ 2+ 2+ + 2+ NH : Cu , Co , Ni , Zn , Ag , Cd 3 － 2+ 2+ 2+ 2+ + 2+ CN : Cu , Co , Ni , Zn , Ag , Cd , Hg2+, Fe2+, Fe2+ － 2+ 2+ 2+ 2+ + 2+ OH : Cu , Co , Ni , Zn , Ag , Cd , Fe2+, Fe3+, Bi3+, Al3+ F－ : Al3+, Fe3+ － + 2+ Cl : Ag , Hg Not stable enough for application of titrimetry But useful for masking purpose Relation between Formation Constant and the Number of Heterocyclic Rings