The Gibbs free energy change determines the voltage of an electrochemical cell. This, in turn, depends on factors such as concentration, gas pressure, and temperature.
ΔG° = Gibbs Free Energy, J
R = gas constant = 8.314 J/(mol∙K)
T = temperature, K
K = equilibrium constant
Consider the following equation for an electrochemical cell reaction.
H2(s) + PbCI2(s) ⇌ Pb(s) + 2HCl(aq)
Predict the immediate effect of the following changes on the observed cell voltage, E.
Increased E Decreased E No change in E
increase the temperature
dissolve NaOH into the solution
increase the amount of PbCl2
dilute the solution by adding H2O
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