Help me with this physical chemistry question please The magnitudes of the stand

Question

Help me with this physical chemistry question please

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

(1) A2+ (aq) + 2e– A(s) |E| = 0.50 V (2) B3+ (aq) + 3e– B(s) |E| = 0.54 V

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 (SHE), current flows from the SHE to A.

What is the standard cell potential for the cell constructed from these two

electrodes?

Explanation / Answer

Since the standard potentials given are the standard reduction potentials, so we see that the standard reduction potential of B is greater than that of A.

So B will get reduced and A will get oxidized in the cell formed.

Using the formula:

Ecell = Eoxid + Ered

Ered = EoB = 0.54

Eoxid = -EoA = -0.50

So,

Ecell = -0.50 + 0.54 = 0.04 V

Related Questions

Navigate

• Browse (All)
• Browse H
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.