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Electrolytic cell - Half-reactions consistent with observations

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During lab I made 4 cells using CuSO4(aq) solution

1. One with a Cu (s) electrode on the negative terminal, and Al(s) on the positive terminal...nothing appeared to happen during this reaction.

2. Cu (s) on negative, Ni (s) on positive...bubbles formed at the anode.

3. Cu (s) on positive, Al (s) on negative...Cu plated out onto Al cathode.

4. Cu (s) on positive, Ni (s) on negative...Cu plated onto Ni.

For each of these reactions I have to give half-reactions consistent with the observations, and then write the overall equation.

I know that this shouldn't be difficult, but I'm not sure what I'm doing, especially for the overall equation for the cells with Cu at the anode....won't the reactions cancel each other out?

Thank you very much .

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Solution Preview

See the attachment.

During lab I made 4 cells using CuSO4(aq) solution

1. One with a Cu (s) electrode on the negative terminal, and Al(s) on the positive terminal...nothing appeared to happen during this reaction.

2. Cu (s) on negative, Ni (s) on positive...bubbles formed at the anode.

3. Cu (s) on positive, Al (s) on negative...Cu plated out onto Al cathode.

4. Cu (s) on positive, Ni (s) on negative...Cu plated onto Ni.

For each of these reactions I have to give half-reactions consistent with the ...

Solution Summary

The solution is given in an attachment in four parts used to come to a conclusion.

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