Standard Reduction Potentials



Standard hydrogen electrode

The hydrogen standard electrode is a platinum electrode plugged in a 1 M solution of H+. This platinum electrode should be in equilibrium with H+ at 1 atmosphere of 25 ° C hydrogen gas surrounding it. The potential of this electrode is set to 0V, and it becomes the reference potential of all the electrodes.

Standard reduction potential

The 'standard reduction potential' is the potential of the electrode with the other side as the standard hydrogen electrode.If the standard reduction potential is (+), it is easier to accept electrons than hydrogen ions, and if negative (-), it is more difficult to accept electrons than hydrogen ions.

Electromotive force (~Battery voltage)

The electromotive force of a cell is easily obtained by using the potential difference of the two electrodes.

The higher the standard reduction potential becomes (+), and the lower one becomes (-).
The higher the standard reduction potential difference, the greater the electromotive force.
Even if the standard reduction potential is (-), it will be (+) pole if it has larger value than the other side.
Even if the standard reduction potential is (+), it will be (-) pole if it has smaller value than the other side.