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Equilibrium Constants and Free Energy Changes from Standard Cell Potentials

This program provides drill in  calculating the standard free energy change and equilibrium constants from the standard cell potential.  The program will show the correct solution for incorrect answers.

Results Total Correct Score%

Click here for Electrode Potentials

Web Author: Dr. Walter S. Hamilton

Standard Electrode Potentials in Aqueous Solutions at 25°C and 1 atm

Cathode Half-Reaction Std Potential(V) Cathode Half-Reaction Std Potential(V)

Li+(aq) + e- = Li(s)         -3.04 IO-(aq) + H2O(l) + 2 e- = I-(aq) + 2 OH-(aq) 0.49
Na+(aq) + e- = Na(s)         -2.71 Cu+(aq) + e- = Cu(s) 0.52
Mg2+(aq) + 2 e- = Mg(s)         -2.38 I2(s) + e- = 2 I-(aq) 0.54
Al3+(aq) + 3 e- = Al(s)         -1.66 Fe3+(aq) + e- = Fe2+(aq)         0.77
2 H2O(l) + 2 e- = H2(g) + 2 OH-(aq) -0.83 Hg22+(aq) + 2 e- = 2 Hg(l) 0.80
Zn2+(aq) + 2 e- = Zn(s)         -0.76 Ag+(aq) + e- = Ag(s)  0.80
Cr3+(aq) + 3 e- = Cr(s)         -0.74 Hg2+(aq) + 2 e- = Hg(l) 0.85
Fe2+(aq) + 2 e- = Fe(s)         -0.41 ClO-(aq) + H2O(l) + 2 e- = Cl-(aq) + 2 OH-(aq) 0.90
Cd2+(aq) + 2 e- = Cd(s)         -0.40 2 Hg2+(aq) + 2 e- = Hg22+(aq) 0.90
Ni2+(aq) + 2 e- = Ni(s)         -0.23 NO3-(aq) + 4 H+(aq)  + 3 e- = NO(g) + 2  H2O(l) 0.96
Sn2+(aq) + 2 e- = Sn(s)         -0.14 Br2(l) + 2 e- = 2 Br-(aq) 1.07
Pb2+(aq) + 2 e- = Pb(s)         -0.13 O2(g) +  4 H+(aq)  + 4 e- =   2  H2O(l) 1.23
Fe3+(aq) + 3 e- = Fe(s)         -0.04 Cr2O72-(aq) + 14 H+(aq) + e- = 2 Cr3+(aq) + 7 H2O(l) 1.33
2 H+(aq) + 2 e- = H2(g)         0.00 Cl2(g) + e- = 2 Cl-(aq) 1.36
Sn4+(aq) + 2 e- = Sn2+(aq)         0.15 MnO4-(aq) + 8 H+(aq)  + 5 e- = Mn2+(aq) + 4  H2O(l) 1.49
Cu2+(aq) + e- = Cu+(aq)         0.16 H2O2(aq) +  2 H+(aq)  + 2 e- =   2  H2O(l)   1.78
Cu2+(aq) + 2 e- = Cu(s)         0.34 S2O82-(aq) + 2 e- = 2 SO42-(aq) 2.01
    F2(g) + 2 e- = 2 F-(aq) 2.87
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