EQUILIBRIUM ELECTROCHEMISTRY
For the PbO2 | PbSO4 couple, − PbO2 (s) + 4H+ + SO2− 4 (aq) + 2e → PbSO4 (s) + 2H2 O(l) − E− = 1.6913 V, νH = 4, ν = 2
E = 1.6913 V − (0.11832 V)pH For pH = 5, E = 1.0997 V For pH = 8, E = 0.7447 V For the PbSO4 /Pb couple, PbSO4 (s) + 2e− → Pb(s) + SO2− 4 (aq) − Since νH = O, E = E − = −0.3588 V at all pH values in the Pourboix diagram.
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