Fe3+滴定Sn2+ 2Fe3++Sn2+=2Fe2++Sn4+ (Imol.L-HCI) q'(Fe/Fe2)=070V,'(Sn/Sn2)=0.14V T/% 电对 电位(V) 9 Sn4+/Sn2+ q=0.14+(0.059/2)×(-1)=0.11 50Sn4/Sn2+ g=0.14 91 Ss n 4+/Sn 2+ q=0.14+(0.059/2)=0.17 99.9 4+/Sn n q=0.14+(0.0592)×3=0.23 100 q=(0.14x2+0.70)(2+1)=0.33 100.1Fe3+Fe2+ q=0.70+0.059×(-3)=0.52 10Fe/e2g-070+0.059×(1=0.64 200 Fe3t/Fe2 q=0.709 2Fe3+ +Sn2+ =2Fe2+ +Sn4+ T/％ 电对 电位（V） 9 Sn4+/Sn2+  =0.14+(0.059/2)×(-1) =0.11 50 Sn4+/Sn2+  =0.14 91 Sn4+/Sn2+  =0.14+(0.059/2)=0.17 99.9 Sn4+/Sn2+  =0.14+(0.059/2)×3=0.23 100  =(0.14x2+0.70)/(2+1)=0.33 100.1 Fe3+/Fe2+  =0.70+0.059×(-3)=0.52 110 Fe3+/Fe2  =0.70+0.059×(-1)=0.64 200 Fe3+/Fe2  =0.70 Fe3+滴定Sn2+ (1mol·L-1HCl) 3+ 2+ 4+ 2+     (Fe /Fe ) = 0.70V, (Sn /Sn ) = 0.14V