Cell EMF under Nonstandard Conditions (Section)The cell in
Chapter 9, Problem 71E(choose chapter or problem)
The cell in Figure 20.9 could be used to provide a measure of the pH in the cathode half-cell. Calculate the pH of the cathode half-cell solution if the cell emf at 298 K is measured to be \(+0.684 \mathrm{V}\) when \(\left[\mathrm{Zn}^{2+}\right]=0.30 \mathrm{M}\) and \(P_{\mathrm{H}_{2}}=0.90 \mathrm{~atm}\).
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