Abstract

The potentiometric study of neutralisation at 25°C, in Na + (ClO − 4)3M medium, with NaOH as titrant, of solutions: Cd 2+ cation-lactic acid (between neutralisation rate values 0 to 1); and of Cd 2+ cation-malonic acid (between neutralisation rate values 1–2), allows consideration of the formation of mononuclear complexes with lactic acid, and mononuclear and polynuclear complexes with malonic acid. The interpretation of experimental data ph = f( x) R induces one to suppose the existence of the following species: lactic acid: Cd(Lact) +, Cd(Lact) 2; malonic acid; Cd(Mal); Cd(Mal) 2− 2; Cd(Mal) 4− 3; Cd 2(Mal) 2; Cd 2(Mal) 2− 3. The constants of formation of those complexes have been determined by non-linear regression.

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