Example Galvanic cell 8.22 Nernst equation, measurement of pH Hydrogen electrode combined using the salt bridge with the saturated calomel electrode was used for measurements of pH. Cell potential of the cel (-) PtH2(p=pst=101.325kPa)H+(aH+)KCl( saturated) Hg2Cl2(s)Hg(l)(+) measured at temperature 298.15K was E=0.575V. Calculate pH of the solution in the hydrogen electrode. Data: reduction electrode potential of the saturated calomel electrode at 298.15K:E(HgCl/Hg)=0.244V. Solution: 1.Writetheschemeofgalvaniccell2.Nernstequationforcathodicreaction3.Nernstequationforanodicreaction4.CellpotentialE=Ecathode,reductionEanode,reduction [4. E=Ecathode,reductionEanode,reduction= =[2FRTln(aH+)21]=FRTlnaHaH=pH=