A voltaic cell is constructed. One electrode compartment consists of an aluminum

Question

A voltaic cell is constructed. One electrode compartment consists of an aluminum strip placed in a solution of Al(NO_3)_3 and the other has a nickel strip placed in a solution of NiSO_4, The overall cell reaction is 2 Al(s) + 3 Ni^2+(aq) + 2 Al^3+(aq) + 3 Ni(s) Express A + B as chemical expression What is being oxidized? What is being reduced? Write the half-cell reactions that occur in the two electrode compartment s Express answers as chemical equations including phases Anode Cathode Which electrode is the anode and which is the cathode Indicate the signs of the electrodes? Do electrons flow from the aluminum electrode to the nickel electrode, from the nickel to the aluminum In which directions do cations and anions migrate through the solution? Assume the Al is not coated with its oxide.

Explanation / Answer

For the given votaic cell,

A) Al is being oxidized

B) Ni is being reduced

C) half-cell reactions

anode : Al(s) <--> Al3+(aq) + 3e-

cathode : Ni2+(aq) + 2e- <--> Ni(s)

D) Al is anodic as oxidation occurs and Ni is cathodic as reduction occurs

E) Al electrode would be +ve and Ni electrode is negative

F) electrons flow from Al (anode) to Ni (cathode) electrode

G) Anions migrate towards the positive electrode that is to the anode and cations migrate to the negative electode that is the cathode.

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