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Question

The standard redox potential for reactions Mn​​​​​2++2e -----> Mn and       Mn​​​​​3+ +1e -----> Mn​​​​​2+ are 2.36 and 1.51V respectively . What is the redox potential for the reaction Mn​​​​​3++3e------> Mn ?


Solution

Mn​​​​​2++2e -----> Mn ------(1)    standard redox potential.E01=2.36V

Mn​​​​​3+ +1e -----> Mn​​​​​2+------(2)    standard redox potential.E1=1.51V

(1)+(2)

=>Mn​​​​​3++3e------> Mn    standard redox potential.Enet=E0+E1=2.36+1.51=3.87V

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