3. Based on the information in the table of standard reduction potentials below,

Question

3. Based on the information in the table of standard reduction potentials below, what is the standard cell potential for an electrochemical cell that has iron (Fe) and magnesium (Mg) electrodes immersed in IM Fe and Mg solutions? Also, identify the cathode Fe3+ + 3 e-Fe +0.771 Mg2+ + 2 e- Mg -2.37 3. An electrochemical cell is constructed with a zinc metal anode in contact with a 0.065 M solution of zinc nitrate and a silver cathode in contact with a 0.0051 M solution of silver(l) te. What is the value of Q to use in the Nernst equation for this cell?

Explanation / Answer

3)

At Anode :

Oxidation : Mg ---------> Mg+2 + 2e-       Eo = - 2.37 V

At Cathode :

Reduction : Fe+3 +   3e-   ----------> Fe      Eo = 0.771 V

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overall : Mg + Fe+3 (aq) ----------> Mg+2 + Fe

Eocell = Eored - Eooxidation

          = 0.771 - (- 2.37)

Eocell = 3.14 V

Cathode is iron.

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