Chemistry · Electrochemical cells: Electrolytic and Galvanic cells, different types of electrodes, electrode potentials including standard electrode potential, half-cell and cell reactions
Is the reaction, possible?
Is the reaction, \( 2 A l+3 F e^{2+} \rightleftharpoons \) \( 2 A l^{3+}+2 F e \) possible?
- A. No, because standard oxidation potential of \( A l<F e \)
- B. Yes, because standard oxidation potential of \( A l>F e \)
- C. cannot be predicted
- D. Yes, because aluminium is a strong oxidising agent
Step-by-step solution
The standard reduction potential of Al³⁺/Al is -1.66 V and of Fe²⁺/Fe is -0.44 V. Al has a higher oxidation potential (1.66 V) than Fe (0.44 V), so Al is more easily oxidized. The cell potential E° = E°(cathode) - E°(anode) = (-0.44) - (-1.66) = +1.22 V > 0, indicating the reaction is spontaneous under standard conditions. Thus, the reaction is possible.
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