A vivid demonstration of dependence of overvoltage on the physical state of a metal deposited on the electrode

Ali Mardan and Rumana Ajaz
Applied Chemistry Division, PINSTECH, P. O. Nilore, Islamabad, Pakistan
J. Chem. Educ., 2000, 77 (12), p 1580
DOI: 10.1021/ed077p1580
Publication Date (Web): December 1, 2000
History, Education, and Documentation

Abstract

A procedure for demonstrating the dependence of overvoltage (observed as rate of hydrogen discharge) on the physical state of metal deposited on the electrode (platinum metal vs platinum metal coated with a porous layer of platinum black) is described. The demonstration utilizes a platinum wire, a tin-lead alloy solder wire, a platinizing instrument, a platinizing solution, and a 1.5 M solution of HCl. When a piece of platinum wire with one end platinized and the other end having a solder spot is immersed in 1.5 M HCl solution, the rate of production of hydrogen bubbles is strikingly greater than when the wire has only a spot of solder on one end.

Keywords (Domain):

Analytical Chemistry

Keywords (Feature):

Tested Demonstrations

Keywords (Subject):

Electrochemistry
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  • Received: August 03, 2009

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