Final answer:
The standard electrode potential for the oxidation of Ni to Ni²+ is 0.28 V. The overall reaction is not balanced due to the difference in the number of electrons consumed and produced. Standard potentials are independent of stoichiometry.
Step-by-step explanation:
The standard electrode potential for the reaction Ni²+(aq) + 2e¯ → Ni(s) is E° = 0.28 V for the oxidation of Ni to Ni²+. The overall reaction is not balanced because of the difference in the number of electrons consumed in the reduction and produced in the oxidation. However, it's important to note that standard potentials are independent of the stoichiometry.