Solution of the task 665 of the collection on general c

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665. In which cases does the electrode potential depend on the pH of the solution? How the electrode potentials of the following electrochemical systems change with increasing pH: a) CrO42- + 2H2O + 3e-↔CrO2- + 4OH-; B) MnO4- + 8H ++ 5e-↔Mn2 ++ 4H2O; C) Sn4 ++ 2e-Snn +? Answer justify

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