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Standard Reduction Potentials

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    Cathode (Reduction) Half-Reaction Standard Reduction Potential E° (volts)
    Li+(aq) + e- → Li(s) -3.04
    Rb+ + e- → Rb (s) -2.98
    K+(aq) + e- → K(s) -2.93
    Cs+(aq) + e- → Cs(s) -2.92
    Ba2+(aq) + 2e- → Ba(s) -2.91
    Sr2+(aq) + 2e- → Sr(s) -2.89
    Ca2+(aq) + 2e- → Ca(s) -2.76
    Na+(aq) + e- → Na(s) -2.71
    Mg2+(aq) + 2e- → Mg(s) -2.38
    Al3+(aq) + 3e- → Al(s) -1.66
    Mn2+(aq) + 2e- → Mg(s) -1.19
    2H2O(l) + 2e- → H2(g) + 2OH-(aq) -0.83
    Zn2+(aq) + 2e- → Zn(s) -0.76
    Cr3+(aq) + 3e- → Cr(s) -0.74
    Fe2+(aq) + 2e- → Fe(s) -0.41
    Cd2+(aq) + 2e- → Cd(s) -0.40
    Co2+(aq) + 2e- → Co(s) -0.28
    Ni2+(aq) + 2e- → Ni(s) -0.23
    Sn2+(aq) + 2e- → Sn(s) -0.14
    Pb2+(aq) + 2e- → Pb(s) -0.13
    Fe3+(aq) + 3e- → Fe(s) -0.04
    2H+(aq) + 2e- → H2(g) 0.00
    Sn4+(aq) + 2e- → Sn2+(aq) 0.15
    Cu2+(aq) + 2e- → Cu+(aq) 0.16
    ClO4-(aq) + H2O(l) + 2e- → ClO3-(aq) + 2OH-(aq) 0.17
    AgCl(s) + e- → Ag(s) + Cl-(aq) 0.22
    Cu2+(aq) + 2e- → Cu(s) 0.34
    ClO3-(aq) + H2O(l) + 2e- → ClO2-(aq) + 2OH-(aq) 0.35
    O-(aq) + H2O(l) + 2e- → I-(aq) + 2OH-(aq) 0.49
    Cu+(aq) + e- → Cu(s) 0.52
    I2(s) + 2e- → 2I-(aq) 0.54
    ClO2-(aq) + H2O(l) + 2e- → ClO-(aq) + 2OH-(aq) 0.59
    Fe3+(aq) + e- → Fe2+(aq) 0.77
    Hg22+(aq) + 2e- → 2Hg(l) 0.80
    Ag+(aq) + e- → Ag(s) 0.80
    Hg2+(aq) + 2e- → Hg(l) 0.85
    ClO-(aq) + H2O(l) + 2e- → Cl-(aq) + 2OH-(aq) 0.90
    2Hg2+(aq) + 2e- → Hg22+(aq) 0.90
    NO3-(aq) + 4H+(aq) + 3e- → NO(g) + 2H2O(l) 0.96
    Br2(l) + 2e- → 2Br-(aq) 1.07
    O2(g) + 4H+(aq) + 4e- → 2H2O(l) 1.23
    Cr2O72-(aq) + 14H+(aq) + 6e- → 2Cr3+(aq) + 7H2O(l) 1.33
    Cl2(g) + 2e- → 2Cl-(aq) 1.36
    Ce4+(aq) + e- → Ce3+(aq) 1.44
    MnO4-(aq) + 8H+(aq) + 5e- → Mn2+(aq) + 4H2O(l) 1.49
    H2O2(aq) + 2H+(aq) + 2e- → 2H2O(l) 1.78
    Co3+(aq) + e- → Co2+(aq) 1.82
    S2O82-(aq) + 2e- → 2SO42-(aq) 2.01
    O3(g) + 2H+(aq) + 2e- → O2(g) + H2O(l) 2.07
    F2(g) + 2e- → 2F-(aq) 2.87

     

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