Question

A nickel-cadmium electrochemical cell functions according to the following reaction:

Cd+ Ni2+ → Cu2+ + Ni

What is the standard cell potential of a nickel-cadmium electrochemical cell?

You made a typo. I'm sure you meant
Cd + Ni2+ → Cd2+ + Ni
Look up the Cd ==> Cd(2+) OXIDATION potential.
Look up the Ni^2+ + 2e ==> REDUCTION potential.
Add the two to get the standard cell potential.
Your text probably gives only the reduction potential. Reverse the reaction in the text, change the sign of the potential listed, and that convert the reduction potential into the oxidation potential

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