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When determining the relative reduction potentials of several electrode systems, why does it not matter what...

When determining the relative reduction potentials of several electrode systems, why does it not matter what is chosen as a reference electrode?

What action(s) is/are required to compare electrode potentials measured relative to different references?

A galvanic cell is created according to the following cell notation:
Al(s) | Al3+(1.0M) || Cu2+(1.0M) | Cu(s)
Reduction Half Reaction E ̊ (volts)
Al3+(aq) + 3e- -> Al(s) -1.66
Cu2+(aq) + 2e- -> Cu(s) 0.34

What is the overall cell potential?


What would be the new cell potential if the concentration of Cu2+ were changed from 1.0M to 0.0010M?

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