A galvanic cell is assembled from the following two half-cells
CHEMISTRY · Multi-part · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry
Problem
A galvanic cell is assembled from the following two half-cells.
Cathode: Ag+(aq, 1.0 M) | Ag(s)
Anode: Fe3+(aq, 0.10 M) , Fe2+(aq, 1.0 × 10−3 M) | Pt(s)
The balanced net reaction is:
Ag+(aq) + Fe2+(aq) → Ag(s) + Fe3+(aq)
The standard cell potential is 0.029 V at 298 K.
For all calculations, use R = 8.314 J mol−1 K−1 and F = 9.65 × 104 C mol−1.
(a) Calculate the cell potential at 298 K.
(b) Calculate the cell potential at 333 K, assuming all ion concentrations remain unchanged.
(c) Compare the numerical results from parts (a) and (b). Discuss the origin of the difference in potential with respect to both enthalpic and entropic contributions to the cell’s driving force.