Doubt & Answer Explanation

Answer Explanation

The standard electrode potential 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?3, and gases at a pressure of 1 atm. The values are most often tabulated at 25 °C. This potential difference is created as a result of the difference between individual potentials of the two metal electrodes with respect to the electrolyte.

Although the overall potential of a cell can be measured, there is no simple way to accurately measure the electrode/electrolyte potentials in isolation. A reference electrode, standard hydrogen electrode (SHE), for which the potential is defined or agreed upon by convention, has been 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. established.