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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»


Solution :`{:(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


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