Calculate the standard electrode potential E o for F e + + + + e - → F e + + From the given standard electrode potentials value of two half cells F e + + + 2 e - → F e ; E o = - 0.440 V F e + + + + 3 e - → F e ; E o = - 0.036 V

Question

Calculate the standard electrode potential E o for F e + + + + e - → F e + + From the given standard electrode potentials value of two half cells F e + + + 2 e - → F e ; E o = - 0.440 V F e + + + + 3 e - → F e ; E o = - 0.036 V, + 0 .772 V, – 0 .404 V, + 0 .404 V, – 0 .476 V

MARKS App · Accepted Answer

Δ G o = - n E o F F e 2 + + 2 e - → F e .....(i) Δ G o = - 2 × F × ( - 0.440 V ) = 0.880 F F e 3 + + 3 e - → F e .....(ii) ΔG o = − 3 × F × − 0 .036 = 0 .108 F On subtracting equation (i) from (ii) F e 3 + + e - → F e 2 + ΔG o = 0 .108 F − 0 .880 F = − 0 .772 F E o for the reaction = - Δ G o n F = - ( - 0.772 F ) 1 × F =+ 0.772 V

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