What is the standard electrode potential for the electrode `MnO_(4)^(-)//MnO_(2)` in solution ?
`("Given: "E_(MnO_(4)^(-)//Mn^(2+))^(@)=1.51" volt," E_(MnO_(2)//Mn^(2+))^(@)=1.23"volt")`

Answer

1.7 volt

Explanation

`{:(MnO_(4)^(-)+8H^(+)+5e^(-) rarr Mn^(2+)+4H_(2)O," "E^(@)=1.51" volt"),(MnO_(2)+4H^(+)+2e^(-) rarr Mn^(2+)+2H_(2)O," "E^(@)=1.23" volt"),("Subtracting"),(bar(MnO_(4)^(-)+4H^(+)+3e^(-) rarr MnO_(2)+2H_(2)O," "E^(@)=?" ")):}`
`E^(@)=(5xx1.51-2xx1.23)/(3)=(7.55-2.46)/(3)=5.09/3=1.70` volt