ELECTRODE POTENTIAL
 
 
DEFINITION
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When a metal (electrode) is immersed in a solution containing the ions of that metal, a potential difference is set up between the metal and its ions in the solution. This potential difference is referred to as "ELECTRODE POTENTIAL".
EXPLANATION
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If a copper plate is dipped in a solution of copper sulphate (CuSO4) a potential difference is set up between copper and Cu+ -ions which is known as electrode potential.
Electrode potential may be positive or negative depending upon the nature of electrode.
STANDARD
ELECTRODE POTENTIAL
 
When concentration of solution in which electrode is immersed is 1.00M, temperature is 25oC and pressure is 1.00 atmosphere, then the electrode potential is called standard electrode potential. It is denoted by Eo.
CHARACTERISTICS OF ELECTRODE POTENTIAL
 
Electrode potential is the measure of the tendency of an electrode to loose or gain electron (s).
In other words electrode potential describes the tendency of an element to oxidize or reduce.
Electrode potential also determines the chemical activity of an element.
OXIDATION POTENTIAL
 
It is the measure of tendency of an element to oxidize.
REDUCTION POTENTIAL
 
It is the measure of tendency of an element to reduce.
UNIT OF ELECTRODE POTENTIAL
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Unit of electrode potential is "VOLT".
HYDROGEN ELECTRODE
 
Hydrogen electrode is the reference electrode used to compare electrode potential of different electrode because absolute electrode potential can not be measured.
"A hydrogen electrode consists of a platinum bar immersed in 1.00M solution of H2SO4. A current of pure hydrogen gas is passed through the solution under 1.00 atmosphere. The platinum plate adsorbs hydrogen at its surface and platinum plate is coated with hydrogen. The plate now behaves as if it were made of hydrogen. The electrode potential of hydrogen electrode is assumed to be 0.00V at all temperatures.".
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