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10 ELECTROCHEMISTRY eLearn.Punjab

10.4 THE ELECTROCHEMICAL SERIES

When elements are arranged in the order of their standard, electrode potentials on the
hydrogen scale, the resulting list is known as electrochemical series.
Such a series of elements is shown in Table (10.2). The electrode potentials have been given
in the reduction mode as recommended by the International Union of Pure and Applied Chemists
(IUPAC). In some textbooks, half reactions are written in the oxidation mode and the corresponding
potentials are oxidation potentials. The magnitude of the potential is not affected by the change
in mode but the signs are reversed. Therefore, before using standard electrode potential data,
it is necessary to ascertain which mode is being used. An important point to remember in using
reduction potential values is that they relate only to standard conditions i.e. 1 M solution of ions,
25°C and one atmospheric pressure. Changes in temperature, concentration and pressure will
affect the values of reduction potential.

Animation 10.12: ELECTROCHEMICAL
Source & Credit : skleac

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