Studies on the Reaction Between Nitrite and Iodide by Using Microelectrodes in Stationary and Convective Systems

✍ Scribed by Vânia Mori; Mauro Bertotti

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 72 KB
• Volume: 11
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/(sici)1521-4109(199904)11:4<234::aid-elan234>3.0.co;2-w

✦ Synopsis

The chemical reaction involving iodide and nitrite at the surface of platinum disk microelectrodes has been investigated in sulfuric acid medium. Experimental conditions were adjusted to achieve a quasi-®rst order homogeneous catalytic reaction in quiescent solutions and the kinetic rate constant for this system was found to be 3.2610 2 M À1 s À1 . Preliminary experiments where electrodes of different radii were used in a wall-jet cell con®guration under conditions of variable mass-transfer are presented. The results indicate the advantages of using microelectrodes in this controllable convective system for determining kinetic rate constants of homogeneous chemical reactions coupled to electrode processes.