The standard reduction potential for Fe^3+(aq) | Fe(s) electrode is -0.036 V, an
ID: 1057765 • Letter: T
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.