Which of the following reactions are feasible, if the electrode potential $$areEoI2/I-=0.54$$ V,$$EoFe3+/Fe2+=0.77$$ V,$$EoAg+/Ag=0.8$$ V and $$EoCu2+/Cu=0.34$$ V

Question

Which of the following reactions are feasible, if the electrode potential $$areEoI2/I-=0.54$$ V,$$EoFe3+/Fe2+=0.77$$ V,$$EoAg+/Ag=0.8$$ V  and $$EoCu2+/Cu=0.34$$ V

Infinity Learn · Accepted Answer

For a reaction to be feasible, Eocell  must be positive andEosell $$=Eooxi+Eored$$ or Eocell $$=Eocathode$$ $$-Eoanode$$  (a) $$Fe3+(aq)$$ and $$I-(aq)(a)$$ Oxidation $$half-reaction2$$Γ(aq)⟶$$I2(s)+2e-$$;$$Eo=-0.54$$ VReduction $$half-reaction2Fe3+(aq)+2e-$$⟶$$2Fe2+(aq)$$;  E°$$=+0.77$$ VOverall reaction,$$2Fe3+(aq)+2I(aq)$$⟶$$2Fe2+(aq)+I2(s)E$$°$$=+0.23$$ VPositive emf indicates that the reaction is feasible.(b) Oxidation half reaction,$$Cu(s)$$⟶$$Cu2+(aq)+2e-$$;E°$$=-0.34$$ VReduction half reaction,$$2Ag+(aq)+2e-$$⟶$$2Ag(s)$$;E°$$=+0.80$$ VOverall reaction,$$Cu(s)+2Ag+(aq)$$⟶$$Cu2+(aq)+2Ag$$;E°$$=+0.46$$ VPositive emf indicates that the reaction is feasible.(c) Oxidation $$half-reaction$$,$$Cu(s)$$⟶$$Cu2+(aq)+2e-$$;E°$$=-0.34$$ VReduction $$half-reaction$$,$$Fe3+(aq)+e-$$⟶$$Fe2+(aq)$$×$$2$$;E°$$=+0.77$$ VOverall reaction,$$Cu(s)+2Fe3+(aq)$$⟶$$Cu2+(aq)+2Fe2+(aq)$$                                           E°$$=+0.43$$ VPositive emf indicates that the reaction is feasible.(d) Oxidation $$half-reaction$$,$$Ag(s)$$⟶$$Ag+(aq)+e-$$;E°$$=-0.80$$ VReduction $$half-reaction$$,$$Fe3+(aq)+e-$$⟶$$Fe2+(aq)$$;  E°$$=+0.77$$ VOverall reaction,$$Ag(s)+Fe3+(aq)$$⟶$$Ag+(aq)+Fe2+(aq)$$;E°$$=-0.03$$ VNegative emf indicates that the reaction is not feasible.

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