Question

Calculate the standard electrode potential for the redox reaction 2Fe2+(aq) + Cl2(g) → 2Fe3+(aq) + 2Cl−(aq) given that the standard reduction potential for Fe3+/Fe2+ couple is +0.771 V and E° for Cl2/Cl− couple is +1.36 V.

Answer 1

To calculate the standard electrode potential for the given redox reaction, we need to determine the oxidation and reduction half-reactions and their corresponding standard reduction potentials.The given reaction is:2Fe aq  + Cl g   2Fe aq  + 2Cl aq First, we identify the oxidation and reduction half-reactions:Oxidation half-reaction: Fe aq   Fe aq  + eReduction half-reaction: Cl g  + 2e  2Cl aq Now, we use the given standard reduction potentials:E Fe/Fe  = +0.771 V  given E Cl/Cl  = +1.36 V  given Since the Fe is being oxidized, we need to reverse the sign of its standard reduction potential to get the standard oxidation potential:E Fe/Fe  = -0.771 VNow, we can calculate the standard electrode potential  E  for the overall redox reaction using the formula:E cell  = E reduction  + E oxidation E cell  = E Cl/Cl  + E Fe/Fe E cell  =  +1.36 V  +  -0.771 V E cell  = 0.589 VSo, the standard electrode potential for the given redox reaction is 0.589 V.