How would you determine the standard electrode potential of the systemMg2+ | Mg?

Q3.1: How would you determine the standard electrode potential of the systemMg2+ | Mg?

Solution:

Use standard hydrogen electrode as anode and Mg²⁺ | Mg as a cathode we can measure the standard electrode potential of systemMg²⁺ | Mg. Standard hydrogen electrode, represented by Pt(s), H₂(g) (1 atm) | H⁺ (aq) and dip the electrode of Magnesium wire in a 1M MgSO₄ solution .The standard hydrogen electrode is always zero.

Use formula

E^o_cell = E^o _right  – E^o_left

The standard hydrogen electrode is always zero.

So that the value of

E^o_left =0

Hence

E^o_cell = E^o _Mg|Mg2+

Or

E^o_Mg|Mg2+= E^o_cell