Table 20.1 Standard Reduction Potentials Half-reaction E.V K++e- K -2.925 Ba2++2e →Ba -2.90 Ca2++2e →Ca -2.87 Na +e Na -2.714 -2.37 -1.66 Zn(OH)2+2e →Zn+20H -1.245 Mn2+ +2e →Mn -1.18 Fe(OH)2+2e →Fe+2OH -0.877 224 +2e -0.763 C++3e Zn →Cr -0.74 Fe2++2e Fe -0.440 Cd2++2e Cd -0.403 Pb SO2- -0.356 →C0 -0.277 Ni2++2e →Ni -0.250 Sn2++2e- Sn -0.136 Pb2++2e- Pb -0.126 2H30t+2e ÷H2+2H20 0.00 Sn++2e- ,Sn2+ +0.15 AgCl +e- →Ag+C1 +0.222 9 →2Hg+2C1 +0.27 Cu +0.337 NiO,+2H2O+2e Ni(OH)2+20H +0.49 I2+2e →2I +0.5355 书上附录7 MnO4+2H2O+3e →MnO2+4OH +0.588 Fe3++e- +0.771 Hg22++2e- →2Hg +0.789 Ag++e- (P421-424,酸表； →Ag +0.7991 Br2(0+2e →2Br +1.0652 Pt2+2e- →Pt +1.20 02+4H0++4 →6H20 +1.23 P424-425,碱表) +1.3595 +3e Au +1.50 MnO+8HO++5e- Mn2++12H20+1.51 Pb02+S042-+4H30++2e PbS04+6H20+1.685 F2+2e →2F +2.87 26 上页 下页 节首 节尾26 书上附录 7 (P421-424，酸表; P424-425，碱表)