Question

define standard electrode potential

Answer 1

Standard electrode potential (E°) (standard reduction potentials) aredefined by measuring the potentialrelative to a standard hydrogenelectrode using 1 mol solution at 25 °C. The convention is to designate the cell so that the oxidised form is written first.

Answer 2

A Standard Hydrogen Electrode (SHE) is an electrode that scientists use for reference on all half-cell potential reactions. The value of the standard electrode potential is zero, which forms the basis one needs to calculate cell potentials using different electrodes or different concentrations.