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April 25th, 2016, 11:49 PM   #1
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Electrochemistry Problem

The magnitudes of the standard potentials of two metals A and B were determined to be:

1) A^2+ + 2e ---> A E=0.50V

2) B^3+ + 3e ---> B E=0.54V

When the two electrodes are connected, current flows from B to A in the external circuit. When the electrode (1) is connected to the standard hydrogen electrode, current flows from the SHE to A.

i) What are the signs of E of the two half reactions?

ii) What is the standard cell potential for the cell constructed from those two electrodes?

Am I correct in saying that since the current is flowing from B to A this means that B undergoes oxidation and so 2) is the anode therefore 1) is the cathode?

How am I meant to work out the signs for the half reactions?
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June 20th, 2016, 02:54 PM   #2
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If A and B are metals, what do "A^2" and "B^2" mean?
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