Sunday, February 3, 2008

IIT JEE Revision - Electrode Potentials

Electrode potentials

When an electrode in put in solution of ions, a charge is developed between the solution and the electrode. This charge is termed a electrode potential. The electrode potential cannot be measured individually and it is measured in reference to a standard hydrogen electrode.

Standard Hydrogen Electrode

An electrode in which pure dry hydrogen gas is bubbled at 1 atm and 298K about a platinized platinum plate through a solution containing H^+ ions ( for example - HCl solution)

The emf produced is taken as zero volts. All other potential are expressed with SHE potential as zero.

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