Nernst’s Equation

Nernst's Equation

(1) Nernst’s equation for electrode potential

The potential of the electrode at which the reaction,

takes place is described by the equation, 

or

above eq. is called the Nernst equation.

Where,

=the potential of the electrode at a given concentration,

 = the standard electrode potential

R = the universal gas constant, 

T= the temperature on the absolute scale,

n = the number of electrons involved in the electrode reaction,

F = the Faraday constant : (96500 C),

= the concentration of the deposited metal,

= the molar concentration of the metal ion in the solution,

The concentration of pure metal M(s) is taken as unity. So, the Nernst equation for the  electrode is written as,

At 298 K, the Nernst equation for the  electrode can be written as,

For an electrode (half - cell) corresponding to the electrode reaction,

Oxidised form Reduced form

The Nernst equation for the electrode is written as,

At 298 K, the Nernst equation can be written as,

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