Standard Electrode Potentials

Standard Electrode Potentials

Standard Electrode Potentials at 298 Kelvin and 1 Atmosphere.

The reactions are classified by which reactant comes first.

Aluminum

Half Reaction Eo (volts)
Al+3 + 3e- $\leftrightharpoons$ Al -1.662

Barium

Half Reaction Eo (volts)
Ba+2 + 2e- $\leftrightharpoons$ Ba -2.906

Berylium

Half Reaction Eo (volts)
Be+2 + 2e- $\leftrightharpoons$ Be -1.847

Cadmium

Half Reaction Eo (volts)
Cd+2 + 2e- $\leftrightharpoons$ Cd -0.4029

Calcium

Half Reaction Eo (volts)
Ca+2 + 2e- $\leftrightharpoons$ Ca -2.866

Cerium

Half Reaction Eo (volts)
Ce+3 + 3e- $\leftrightharpoons$ Ce -2.483

Cesium

Half Reaction Eo (volts)
Cs+ + e- $\leftrightharpoons$ Cs -2.923

Chromium

Half Reaction Eo (volts)
Cr+3 + 3e- $\leftrightharpoons$ Cr -0.744
Cr+3 + e- $\leftrightharpoons$ Cr+2 -0.408

Cobalt

Half Reaction Eo (volts)
Co+2 + 2e- $\leftrightharpoons$ Co -0.277

Copper

Half Reaction Eo (volts)
Cu+2 + 2e- $\leftrightharpoons$ Cu +0.337
Cu+1 + e- $\leftrightharpoons$ Cu +0.521

Gallium

Half Reaction Eo (volts)
Ga+3 + 3e- $\leftrightharpoons$ Ga -0.529

Hydrogen

Half Reaction Eo (volts)
2H+ + 2e- $\leftrightharpoons$ H2 0.0000

Iodine

Half Reaction Eo (volts)
I2 + 2e- $\leftrightharpoons$ 2I- +0.5355

Iron

Half Reaction Eo (volts)
Fe+2 + 2e- $\leftrightharpoons$ Fe -0.4402
Fe+3 + e- $\leftrightharpoons$ Fe+2 +0.771

Lead

Half Reaction Eo (volts)
Pb+2 + 2e- $\leftrightharpoons$ Pb -0.126
PbSO4 + 2e- $\leftrightharpoons$ Pb + SO4 -2 -0.3588

Lithium

Half Reaction Eo (volts)
Li+ + e- $\leftrightharpoons$ Li -3.045

Magnesium

Half Reaction Eo (volts)
Mg+2 + 2e- $\leftrightharpoons$ Mg -2.363

Manganese

Half Reaction Eo (volts)
Mn+2 + 2e- $\leftrightharpoons$ Mn -1.180
MnO4- + e- $\leftrightharpoons$ MnO4-2 +0.564

Mercury

Half Reaction Eo (volts)
Hg+2 + 2e- $\leftrightharpoons$ Hg +0.854
2Hg+2 + 2e- $\leftrightharpoons $ ]] Hg,,2,,^^+2^^�450��451�+0.920�452��453��454��455�Hg,,2,,^^+2^^ + 2e^^-^^ [[$ \leftrightharpoons$ 2Hg +0.788

Nickle

Half Reaction Eo (volts)
Ni+2 + 2e- $\leftrightharpoons$ Ni -0.250

Nitrogen

Half Reaction Eo (volts)
2NO3- + 4H+ + 2e- $\leftrightharpoons$ N2O4 + 2H2O +0.803

Oxygen

Half Reaction Eo (volts)
O2 +2H+ +2e- $\leftrightharpoons$ H2O2 +0.6824

Phosphorus

Half Reaction Eo (volts)
H3PO4 + 2H+ $\leftrightharpoons$ H3PO3 + H2O -0.276

Potassium

Half Reaction Eo (volts)
K+ + e- $\leftrightharpoons$ K -2.925

Radium

Half Reaction Eo (volts)
Ra+2 + 2e- $\leftrightharpoons$ Ra -2.916

Rubidium

Half Reaction Eo (volts)
Rb+ + e- $\leftrightharpoons$ Rb -2.925

Silver

Half Reaction Eo (volts)
Ag+ + e- $\rightleftharpoons$ Ag +0.7991
AgCl + e- $\rightleftharpoons$ Ag + Cl- +0.2222

Sodium

Half Reaction Eo (volts)
Na+ + e- $\leftrightharpoons$ Na -2.714

Strontium

Half Reaction Eo (volts)
Sr+2 + 2e- $\leftrightharpoons$ Sr -2.888

Sulfur

Half Reaction Eo (volts)
S + 2H+ + 2e- $\leftrightharpoons$ H2S(aq) +0.142
SO4-2 + 4H+ + 2e- $\leftrightharpoons$ H2SO3 + H2O +0.172
H2SO3 + 4H+ +4e- $\leftrightharpoons$ S + 3H2O +0.450

Thallium

Half Reaction Eo (volts)
Tl+ + e- $\leftrightharpoons$ Tl -0.3363

Tin

Half Reaction Eo (volts)
Sn+2 + 2e- $\leftrightharpoons$ Sn -0.136
Sn+4 + 2e- $\leftrightharpoons$ Sn+2 +0.15

Zinc

Half Reaction Eo (volts)
Zn+2 + 2e- $\leftrightharpoons$ Zn -0.7628
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