What are the limitations of the Nernst equation ?

What are the limitations of the Nernst equation ?
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Answer :

: For dilute solutions, direct ion concentrations can be used in the Nernst equation. But in the case of dense solutions the value of activity co-efficient is not equal to 1 , in which case the cell potential cannot be measured directly using the density. On the other hand , in the case of dense solutions, a weak gravitational force acts between the ions of opposite charge. Therefore the amount of free ions participating in oxidation and deoxidation also decreases. Therefore, the Nernst equation cannot give an accurate idea about the cell potential of a high-density solution. That is, the Nernst equation is mainly applicable to dilute solutions.
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