<P> In electrochemistry, the standard electrode potential, abbreviated E ° or E (with a superscript plimsoll character, pronounced "standard" or "nought"), is the measure of individual potential of a reversible electrode at standard state, which is with solutes at an effective concentration of 1 mol dm, and gases at a pressure of 1 atm . The reduction potential is an intensive property . The values are most often tabulated at 25 ° C. The basis for an electrochemical cell such as the galvanic cell is always a redox reaction which can be broken down into two half - reactions: oxidation at anode (loss of electron) and reduction at cathode (gain of electron). Electricity is generated due to electric potential difference between two electrodes . This potential difference is created as a result of the difference between individual potentials of the two metal electrodes with respect to the electrolyte . (Reversible electrode is an electrode that owes its potential to changes of a reversible nature, in contrast to electrodes used in electroplating which are destroyed during their use .) </P> <P> Although the overall potential of a cell can be measured, there is no simple way to accurately measure the electrode / electrolyte potentials in isolation . The electric potential also varies with temperature, concentration and pressure . Since the oxidation potential of a half - reaction is the negative of the reduction potential in a redox reaction, it is sufficient to calculate either one of the potentials . Therefore, standard electrode potential is commonly written as standard reduction potential . </P> <P> The electrode potential cannot be obtained empirically . The galvanic cell potential results from a pair of electrodes . Thus, only one empirical value is available in a pair of electrodes and it is not possible to determine the value for each electrode in the pair using the empirically obtained galvanic cell potential . A reference electrode, standard hydrogen electrode (SHE), for which the potential is defined or agreed upon by convention, needed to be established . In this case SHE is set to 0.00 V and any electrode, for which the electrode potential is not yet known, can be paired with SHE--to form a galvanic cell--and the galvanic cell potential gives the unknown electrode's potential . Using this process, any electrode with an unknown potential can be paired with either the SHE or another electrode for which the potential has already been derived and that unknown value can be established . </P>

What is standard electrode potential of a cell
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