A concentration cell is made using two Ni electrodes with Ni 2+ concentrations o
ID: 924602 • Letter: A
Question
A concentration cell is made using two Ni electrodes with Ni2+ concentrations of 1.0 M and 1.0x10-4 M in the two half-cells. Which of these statements about this cell is false?
The 1.0x10-4 M Ni2+ solution is in the anode half-cell.
Eo for the overall reaction is 0 V.
The overall cell potential will be -.26 V.
When the cell reaction reaches equilibrium, the Ni2+ concentrations will be equal.
a.The 1.0x10-4 M Ni2+ solution is in the anode half-cell.
b.Eo for the overall reaction is 0 V.
c.The overall cell potential will be -.26 V.
d.When the cell reaction reaches equilibrium, the Ni2+ concentrations will be equal.
Explanation / Answer
The E° Ni/Ni2+ is -0.25 V. So if the two electrodes are made of Ni, then the E°cell would be 0 v.
Now with this value, we can calculate the overall cell potential:
E = 0 - 0.059/2 log (1x10-4 / 1)
E = 0 + 0.118 v
E = 0.118 V
This means that even if you inverse the concentrations, the result would be the same but negative, so the cell potential it's not -0.26 V. Option C is false.
Hope this helps.
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