A galvanic cell is arranged as Pt(s) | Cl (g, 1.0 atm) | Cl (aq, 1.0 M) || Ag (aq,…
CHEMISTRY · Single correct · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry
Problem
A galvanic cell is arranged as
Pt(s) | Cl2(g, 1.0 atm) | Cl− (aq, 1.0 M) || Ag+ (aq, 1.0 M) | Ag(s).
The pressure of Cl2 is increased to 2.0 atm while all solution concentrations remain 1.0 M. Which statement most accurately describes the effect of this change on the cell potential?
(a) The potential is unchanged because changes in gas pressure do not affect cell voltage.
(b) The potential increases because the larger PCl2 lowers Q, moving the cell farther from equilibrium.
(c) The potential decreases because the added Cl2 drives the reaction toward equilibrium and raises Q.
(d) The potential immediately falls to zero because the extra reactant forces the cell to reach equilibrium.