The complexation reactions of cations with aminocarboxilic acids have been the object of a number of studies. In part, interest in the study of these reactions stems from their extensive use in analytical chemistry. However, there is little literature data available on the silver ion with these ligands. In the only few detailed studies we know of on the reaction of Ag + with ethylene-diaminetetra-acetic acid (EDTA), the equilibrium constant has been determined, in one case at three different temperatures [1 -4].