The standard reduction potential for Fe^3+(aq) | Fe(s) electrode is -0.036 V, an

Question

The standard reduction potential for Fe^3+(aq) | Fe(s) electrode is -0.036 V, and for the Fe^2+(aq) | Fe(s) electrode it is -0.4402 V. The standard oxidation potential for the Fe(s) | Fe^2+ half cell is V (4 dec places). The cell potential for the Fe(s) | Fe^2+(aq) || Fe^3+(aq) | Fe(s) is V (4 dec places). A positive cell potential indicates that the chemical reaction in the cell can be used to generate electrical work. Can this reaction be used to generate work? (yes/no). Does the potential of the Fe^3+ (aq) | Fe(s) electrode depend on the size of the iron electrode? (yes/no).

Explanation / Answer

1) standard oxidation potential for Fe (s) I Fe2+ half cell = - standard reduction potential for Fe2+(aq) I Fe(s)

                                                                                = - (-0.4402 V)

                                                                              = + 0.4402 V

2) Cell potential = -0.036 V - (-0.4402 V) = + 0.4042 V

                     (or)

Cell potential = oxidation potential + reduction potential = + 0.4402 V - 0.036 V = + 0.4042 V

3) Yes

    Since cell potentila is +ve , it is used to generate electrical work.

4) No

Cell potential does not depend on size of electrode.

Cell potential depends on concentration of substances, temperature.

                      

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