Polarographic study of the electrode reaction of cobalt(II) in aqueous and non-aqueous media

✍ Scribed by J.N. Gaur; N.K. Goswami

• Publisher: Elsevier Science
• Year: 1970
• Tongue: English
• Weight: 438 KB
• Volume: 15
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(70)80002-0

✦ Synopsis

The reduction of cobalt(I1) at the dme has been studied in water and aqueous mixtures of formamide, dimethylformamide and acetonitrile. In water the study was carried out in various complexing and noncomplexing supporting electrolytes. The kinetic parameters have been calculated by Koutecky's method. The reversibility is in the order SO,*-> Br-> COc-> Cl-. The addition of non-aqueous solvent increases the reversibility and rate constant values of the reaction and changes the E,,, to more positive values. The change of polarographic characteristics and kinetic parameters is explained in terms of solvation of the metal ion in these solvents.

R&sum-n a &udi6 la rkduction de cobah & l%lectrode de mercure gouttante dans l'eau et dans les m&nges aqueuses de formamide, dimethylformamide et acetonitrile. Dans l'eau, 1Vtude 6tait accompli en divers &ctrolytes supports complexant et non-complexant. Les Pdtait calculk par la m&hode de Koutecky. La r&ersibilit& est par ordre SO, aram&res cinktiques >Br->CO,-> Cl-. L'addition d'un dissolvant non-aqueux augment la rbversibilitt de la &action, et rendre le El,,