Redox potentials for some first row transition metal ions
Element Reaction E0 (Volt)
Ti TiO2+ + 2H+ + e- Ti3+ + H2O 0.1V
Ti3+ + e- Ti2+ -0.37V
Ti2+ + 2e- Ti -1.63V
V [V(OH)4]+ + 2H+ + e- VO2+ + 3H2O 1.0V
VO2+ + 2H+ + e- V3+ + H2O 0.36V
V2+ + 2e- V -1.18V
Cr Cr3+ + e- Cr2+ -0.41V
Cr3+ + 3e- Cr -0.74V
1/2 Cr2O72- + 7H+ + 3e- Cr3+ + 7/2 H2O 1.33V
HCrO4 + 7H+ + 3e- Cr3+ + 4H2O 1.20V
Mn MnO4- + 8H+ + 5e- Mn2+ + 4H2O 1.51V
MnO4- + 2H2O + 3e- MnO2 + 4OH- 0.588V
Mn2+ + 2e- Mn -1.18V
Fe Fe3+ + e- Fe2+ 0.771V
Fe(OH)3 + e- Fe(OH)2 + OH- -0.877V
Fe2+ + 2e- Fe -0.44V
Co Co3+ + e- Co2+ 1.81V
Co2+ + 2e- Co -0.28V
Ni Ni2+ + 2e- Ni -0.27V
Cu Cu2+ + 2e- Cu 0.34V
Cu2+ + e- Cu+ 0.16V
Cu+ + e- Cu 0.52V
Redox potentials for the halogens
Element Reaction E0 (Volt)
F 1/2 F2 + e- F- 2.87
Cl 1/2 Cl2(aq) + e- Cl- 1.40
Br 1/2 Br2(aq) + e- Br- 1.09
I 1/2 I2(aq) + e- I- 0.62


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