Aqueous Standard Reduction Potentials

James Richard Fromm


Electrode Couple E0, V dE0/dT, mV/K
Na+ + e- rarrow.gif (63 bytes) Na -2.7144 -0.758
Mg++ + 2e- rarrow.gif (63 bytes) Mg -2.3568 +0.208
Al+++ + 3e- rarrow.gif (63 bytes) Al -1.676 +0.532
Zn++ + 2e- rarrow.gif (63 bytes) Zn -0.7621 +0.119
Fe++ + 2e- rarrow.gif (63 bytes) Fe -0.4089 +0.178
Cd++ + 2e- rarrow.gif (63 bytes) Cd -0.4022 -0.030
Tl+ + e- rarrow.gif (63 bytes) Tl -0.3358 -1.313
Sn++ + 2e- rarrow.gif (63 bytes) Sn -0.1410 -0.322
Pb++ + 2e- rarrow.gif (63 bytes) Pb -0.1266 -0.215
2H+ + 2e- rarrow.gif (63 bytes) H2(SHE) 0.0000 0.000
S4O6-- + 2e- rarrow.gif (63 bytes) 2S2O3-- +0.0238 -1.32
Sn++++ + 2e- rarrow.gif (63 bytes) Sn-- +0.1539 -0.159
SO4-- + 4H+ + 2e- rarrow.gif (63 bytes) H2O + H2SO3(aq) +0.1576 +0.784
Cu++ + e- rarrow.gif (63 bytes) Cu+ +0.1607 +0.776
S + 2H+ + 2e- rarrow.gif (63 bytes) H2S +0.1739 -0.224
AgCl + e- rarrow.gif (63 bytes) Ag + Cl- +0.2221 -0.648
Saturated Calomel (SCE) +0.2412 -0.661
UO2++ + 4H+ + 2e- rarrow.gif (63 bytes) U4+ + 4H2O +0.2682 -1.572
Hg2Cl2 + 2e- rarrow.gif (63 bytes) 2Cl- + 2Hg +0.2680 -0.301
Bi+++ + 3e- rarrow.gif (63 bytes) Bi +0.286 ---
Cu++ + 2e- rarrow.gif (63 bytes) Cu +0.3394 +0.011
Fe(CN)6--- + e- rarrow.gif (63 bytes) Fe(CN)6---- +0.3557 -2.494
Cu+ + e- rarrow.gif (63 bytes) Cu +0.5180 -0.754
I2 + 2e- rarrow.gif (63 bytes) 2I- +0.5345 -0.126
I--- + 2e- rarrow.gif (63 bytes) 3I- +0.5354 -0.187
H3AsO4(aq) + 2H+ + 2e- rarrow.gif (63 bytes) H3AsO3(aq) + H2O +0.5748 -0.258
2HgCl2 + 4H+ + 2e- rarrow.gif (63 bytes) Hg2Cl2 + 2Cl- +0.6011 +0.149
Hg2SO4 + 2e- rarrow.gif (63 bytes) 2Hg + SO4-- +0.6152 -0.825
I2(aq) + 2e- rarrow.gif (63 bytes) 2I- +0.6195 -0.443
O2 + 2H+ + 2e- rarrow.gif (63 bytes) H2O2(l) +0.6237 -1.172
O2 + 2H+ + 2e- rarrow.gif (63 bytes) H2O2(aq) +0.6945 -0.317
Fe+++ + e- rarrow.gif (63 bytes) Fe++ +0.769 +1.170
Hg2++ + 2e- rarrow.gif (63 bytes) Hg +0.7955 -0.721
Ag+ + e- rarrow.gif (63 bytes) Ag +0.7991 -0.989
Hg++ + 2e- rarrow.gif (63 bytes) Hg +0.8519 -0.116
2Hg++ + 2e- rarrow.gif (63 bytes) Hg2++ +0.9083 +0.094
NO3- + 3H+ + 2e- rarrow.gif (63 bytes) HNO2(aq) + H2O +0.9275 -0.371
VO2+ + 2H+ + e- rarrow.gif (63 bytes) VO++ + H2O +1.0004 -0.902
HNO2(aq) + H+ + e- rarrow.gif (63 bytes) NO + H2O +1.0362 -0.826
Br2(l) + 2e- rarrow.gif (63 bytes) 2Br- +1.0775 -0.612
Br2(aq) + 2e- rarrow.gif (63 bytes) 2Br- +1.0978 -0.176
2IO3- + 12H+ + 10e- rarrow.gif (63 bytes) 6H2O + I2 +1.2093 -0.245
O2 + 4H+ + 4e- rarrow.gif (63 bytes) 2H2O +1.2288 -0.846
MnO2 + 4H+ + 2e- rarrow.gif (63 bytes) Mn++ + 2H2O +1.1406 -0.643
Cl2 + 2e- rarrow.gif (63 bytes) 2Cl- +1.3601 -1.248
MnO4- + 8H+ + 5e- rarrow.gif (63 bytes) 4H2O + Mn++ +1.5119 -0.646
2BrO3- + 12H+ + 10e- rarrow.gif (63 bytes) 6H2O + Br2 +1.5131 -0.252
Ce++++ + e- rarrow.gif (63 bytes) Ce+++ +1.7432 +0.318

Main Tables

Auxiliary Table


Copyright 1997 James R. Fromm