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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > December  >
In the Classroom
Tested Demonstrations
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
Cover
December 2000
Vol. 77 No. 12
p. 1580
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.
More Information
*  Citation
 Mardan, Ali; Ajaz, Rumana. J. Chem. Educ. 2000 77 1580.
*  Keywords
 Analytical Chemistry; Demonstrations; Electrochemistry; Redox Reactions; Teaching / Learning Aids
*  History
 Created:
Last Updated:		 November 3, 2000
April 15, 2005
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