AP chemistry electrochemistry Galvanic cell

Question

A galvanic cell consists of a silver electrode inserted into a 1.0 M AgNO3 solution connected through a salt bridge and an external circuit to a nickel electrode inserted in a 1.0 M Ni(NO3)2 solution.

Write the overall reaction

Answer 1

From a table of Standard Reduction Potentials:

Ag⁺⁽aq) + e- ==> Ag(s) Eº = 0.80 V

Ni²⁺(aq) + 2e- ==> Ni(s) Eº = -0.25 V

Reduction rxn: 2Ag⁺(aq) + 2e- ==> 2Ag(s)

Oxidation rxn: Ni(s) ==> Ni²⁺ + 2e-

Overall reaction:

2Ag⁺(aq) + Ni(s) ==> 2Ag(s) + Ni²⁺(aq) Eºcell = 1.05 V