Study Of The Stability Constants Of Few Binary Metal-Edta Complexes Using A Novel Ionophoretic Technique

Ionophoretic technique is used as a novel tool for the study of binary metal-EDTA complexes in the solution state. The specially designed simple Ionophoretic tube has been used for the investigation of the stability of metal-EDTA complexes. A graph of mobility against pH is used to obtain the information of stepwise complexation of binary metal-EDTA complexes. The stability constants of Fe(III)-EDTA, Cu (II)-EDTA, Co (II)-EDTA and Ni(II)-EDTA complexes are found to be 1016.67, 1013.53, 1O13.16 and 1012.37 respectively at 250 C. The stability of complexes is in accordance with Irving William4 natural order of stability