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Cr2O72-+ 14H++6e-=2Cr3++7H2O,
E(Cr2O72/Cr3+)
=E0(Cr2O72/Cr3+) +0.0591v/6*lg[Cr2O72-]*[H+]^14/[Cr3+]^2
=E0(Cr2O72/Cr3+) +0.0591v/6*lg[H+]^14
=E0(Cr2O72/Cr3+) -0.0591v/6*14*(-lg[H+])
=E0(Cr2O72/Cr3+) -0.0591v/6*14*pH
显然电极电势随溶液pH的增大而减小
Cl2 +2e-=2Cl-,显然电极电势随溶液pH无关
E(Cr2O72/Cr3+)
=E0(Cr2O72/Cr3+) +0.0591v/6*lg[Cr2O72-]*[H+]^14/[Cr3+]^2
=E0(Cr2O72/Cr3+) +0.0591v/6*lg[H+]^14
=E0(Cr2O72/Cr3+) -0.0591v/6*14*(-lg[H+])
=E0(Cr2O72/Cr3+) -0.0591v/6*14*pH
显然电极电势随溶液pH的增大而减小
Cl2 +2e-=2Cl-,显然电极电势随溶液pH无关
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