The change in the E-cell as the cell operates depends on the concentration of the ions.
Given,
The voltaic cell consists of A/A⁺ and B/B⁺ are half-cells.
where A and B are metals and A electrode is negative.
Also, Ecell > E°cell.
The E-cell changes as the cell operate depending upon the concentration of ions. Therefore, as the concentration of the ion changes, E-cell also changes.
Therefore, when the cell operates Ecell changes is depends on ion concentration.
To find the change in E-cell, we can use the formula
Ecell = E°cell - (0.0591Vn) / log Q
where Q is the [A⁺]/[B⁺]
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