A galvanic cell is based on the spontaneous reaction Ni(s) + 2 Fe (aq) → Ni (aq) + 2…
CHEMISTRY · Single correct · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry
Problem
A galvanic cell is based on the spontaneous reaction
Ni(s) + 2 Fe3+ (aq) → Ni2+ (aq) + 2 Fe2+ (aq),
with each ionic species initially at 1.0 M.
Three successive manipulations are carried out:
1. Solid NiCl2 is added to the anode compartment until [Ni2+] = 2.0 M.
2. Solid Na3Fe(CN)6 is added to the cathode compartment until [Fe3+] = 1.5 M.
3. The entire cell is warmed, causing every aqueous concentration to decrease by one-half due to expansion.
Taken together, how does the final cell potential compare with the original standard cell potential?
(a) It is less than the standard potential.
(b) It is greater than the standard potential.
(c) It is equal to the standard potential.
(d) It has reversed sign, indicating a non-spontaneous cell reaction.