How standard electrode potential can be calculated and state its importance.
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Answer
We can't calculate the electrode potential of a single electrode. Hence it can be calculated by combining it with standard electrode. Standard electrode potential or Standard reduction potential $=$ Electrode potential of cathode - Electrode potential of anode $E _{\text {cell }}^0= \underset{\text{cathode}}{E ^0}- E _{\text {anode }}^0$ The electrode potential of hydrogen electron is considered at zero in standard conditions. Hence, when it is attached with unknown electrode, the electrode potential can be calculated.
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