How Can Temperature Coefficients of Reversible Cells Be Used to Obtain Ionic Entropies

How Can Temperature Coefficients of Reversible Cells Be Used to Obtain Ionic Entropies  

In Section 2.13, it was shown how it is possible to obtain the entropy of solvation for an electrolyte, but that left open the separation into the individual entropies of solvation for each ion. 

A well-known thermodynamic expression for the change in entropy AS° of a process is 

Furthermore, when an electrochemical cell works in a thermodynamically reversible way (see Vol. 2, Chapter 7), 

this AS of a cell reaction must be composed of the entropies of at least two different ions in solution (because two electrode reactions are involved, one at each electrode), so that Eq. (2.58) cannot lead directly to an individual ionic entropy. 

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