Data table Note: ions should be considered aqueous Redox pairHalf-reactionE° (volt)NotesLi⁺/LiLi++𝑒−⇌Li(𝑠)−3.04K⁺/K𝐾++𝑒−⇌𝐾(𝑠)−2.93Ba²⁺/BaBa2++2𝑒−⇌Ba(𝑠)−2.92Ca²⁺/CaCa2++2𝑒−⇌Ca(𝑠)−2.87Na⁺/NaNa++𝑒−⇌Na(𝑠)−2.71Mg²⁺/MgMg2++2𝑒−⇌Mg(𝑠)−2.37Al³⁺/AlAl3++3𝑒−⇌Al(𝑠)−1.66Mn²⁺/MnMn2++2𝑒−⇌Mn(𝑠)−1.18H⁺/H₂2𝐻2𝑂(𝑙)+2𝑒−⇌𝐻2(𝑔)+2OH−−0.83pH = 14Zn²⁺/ZnZn2++2𝑒−⇌Zn(𝑠)−0.76Cr³⁺/CrCr3++3𝑒−⇌Cr(𝑠)−0.74Fe²⁺/FeFe2++2𝑒−⇌Fe(𝑠)−0.44H⁺/H₂2𝐻2𝑂(𝑙)+2𝑒−⇌𝐻2(𝑔)+2OH−−0.41pH = 7Ni²⁺/NiNi2++2𝑒−⇌Ni(𝑠)−0.25Sn²⁺/SnSn2++2𝑒−⇌Sn(𝑠)−0.14Pb²⁺/PbPb2++2𝑒−⇌Pb(𝑠)−0.13Fe³⁺/FeFe3++3𝑒−⇌Fe(𝑠)−0.04H⁺/H₂2𝐻++2𝑒−⇌𝐻2(𝑔)0.00Cu²⁺/CuCu2++2𝑒−⇌Cu(𝑠)+0.34Fe³⁺/Fe²⁺Fe3++𝑒−⇌Fe2++0.77Hg₂²⁺/HgHg2+2+2𝑒−⇌2Hg(𝑙)+0.79Ag⁺/AgAg++𝑒−⇌Ag(𝑠)+0.80Hg²⁺/HgHg2++2𝑒−⇌Hg(𝑙)+0.85Pt²⁺/PtPt2++2𝑒−⇌Pt(𝑠)+1.19Au³⁺/AuAu3++3𝑒−⇌Au(𝑠)+1.50 See also References Wikipedia page for data