Standard Electrode Potential (3)

The electrode potential of zinc

Since the standard hydrogen potential is 0.00 V, the voltmeter reading of 0.76 V shows the electrode potential of zinc

Tendency of zinc to release electrons compared to hydrogen

Zinc, Zn has a greater tendency to release electrons compared to hydrogen

Half equation at the negative terminal (oxidation reaction)

Zn(s) → Zn2+(aq) + 2e−

Half equation at the positive terminal (reduction reaction

2H+(aq) + 2e− → H2 (g)

A standard electrode potential for zinc half-cell is written as reduction

Zn2+(ak) + 2e− ⇌ Zn(p) E° = -0.76 V

Another name for standard electrode potential, E°

Is also known as the standard reduction potential

E° value

Is a measure of the tendency of a substance to accept or donate electrons

The standard electrode potential value, E° for half-cell equations [Li+(aq) + e− ⇌ Li(s)]

-3.04 V

The standard electrode potential value, E° for half-cell equations [K+(aq) + e− ⇌ K(s)]

-2.92 V

The standard electrode potential value, E° for half-cell equations [Ca2+(aq) + 2e− ⇌ Ca(s)]

-2.87 V