Standard reduction Potentials at 25C 2H(aq) +2e →Hg) 0.00 Pb2*(aq) +2e →Pb() -0.13 Sn2*(aq) →sn9 巴0 -0.14 Ni2*(aq) + 2e →Nis) -0.25 Co2*(aq)2e →Cos -0.28 PbSO(s)+2e →pb(s)+SOi(ag) -0.31 Cd2*(aq) +24 →Cds) -0.40 Fe2*(aq) →Fe(s) -0.44 Cr(ag)+3e →C -0.74 Zn2(ag)+2e→Zn) -0.76 2H0+2e →H(g）+20H(ag) -0.83 Mn2t(aq)+2e→Mn(s -1.18 AI3*(aq)+3c→AIs) -1.66 Be*(ag)+2e →Be(s) -1.85 Mg2(aq)+ 2e →Mg(s) -2.37 Na"(aq)+e →Nas) -271 Ca2(aq)+2e→Ca(s -2.87 Sr2*(aq)+2e→Srs) -289 Ba2(aq)+2e→Bas) -2.90 Kt(aa+e→Kd -2.93 Li'(ag+e→Lis -3.05Standard reduction Potentials at 25ºC