8. Using the standard reduction potentials Ni 2+ ( aq ) + 2 e Ni( s ) 0.25 volt

Question

8.    Using the standard reduction potentials

                          Ni2+(aq) + 2 eNi(s) 0.25 volt

                   Fe3+(aq) + eFe2+(aq)        +0.77 volt

       Calculate the value of E°cell for the cell with the reaction:

                   Ni2+(aq) + 2 Fe2+(aq) Ni(s) + 2 Fe3+(aq)

                   a. +0.52 volt

                   b. 1.02 volt

                   c. +2.81 volt

                   d. +1.02 volt

                   e. 2.81 volt

8. Using the standard reduction potentials Ni2+(aa) 2 e Nis 0.25 volt Fe3+(aa) 2+ +0.77 volt (aa) Calculate the value of E for the cell with the reaction: Ni +(aa) 2 Fe2+(ag) Ni(s) 2 Fe Haa) a. +0.52 volt b. -1.02 volt c. +2.81 volt d. +1.02 volt e. -2.81 volt

Explanation / Answer

8) answer : b) - 1.02 volt

Using the standard reduction potentials

Reduction :    Ni2+(aq) + 2 e-------------> Ni(s)                   Eo = 0.25 volt

Oxidation : Fe2+(aq) ----------> Fe3+(aq) + e         Eo = +0.77 volt

    Overall : Ni2+(aq) + 2 Fe2+(aq)----------------> Ni(s) + 2 Fe3+(aq)

Eocell = Eored - Eooxidation

          = - 0.25 - 0.77

Eocell = - 1.02 volt

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