[例8.10]在298K时,分别计算以下电极的还原电极电势,所需的标准电极电势可从表8.4中-|||-查阅。-|||-(1) ^2+((a_{C{a)_(2)}^2+)}=0.1)lCu(s);-|||-(2) ^+((a)_(Br)=0.01)|(H)_(2)((p)^theta )|(pt)_(0)-|||-电极的还原反应 E0/300-|||-(O)_(4)^2-+2(H)_(2)O+2(e)^-arrow Mn(O)_(2)+4(OH)^- +0.60-|||-(O)_(4)^-+(e)^-arrow M(O)_(4)^2- +0.56-|||-_(2)+2(e)^-arrow 2I +0.54-|||-_(3)+2(e)^-arrow 3I +0.53-|||-^++(e)^-arrow Cu +0.52-|||-+(H)_(2)O+(e)^-arrow NiO(OH)_(2)+(OH)^- +0.49-|||-_(2)Cr(O)_(4)+2(e)^-arrow 2Ag+(Cr{O)_(4)}^2- +0.45-|||-_(2)+2(H)_(2)O+4(e)^-arrow 40(H)^- +0.40-|||-(10)^-+(H)_(2)O+2(e)^-arrow C(H{O)_(3)}^-+2(OH)^- +0.36-|||-([ Fe{(CN))_(6)] }^3-+(e)^-arrow ([ Fe{(CN))_(6)] }^4- +0.36-|||-^2++2(e)^-arrow Cu +0.34-|||-(lg )_(2)(Cl)_(2)+2(e)^-arrow 2Hg+2(Cl)^- +0.27-|||-+(e)^-arrow Ag+(Cl)^- +0.22-|||-^3++3(e)^-arrow Bi +0.20-|||-^2++(e)^-arrow Cu' +0.16-|||-(sin )^4++2(e)^-arrow (sin )^2+ +0.15-|||-AgBr+e Ag+Br +0.07-|||-^4++(e)^-arrow ({T)_(i)}^3+ 0.00-|||-(H)^++2(e)^-arrow (H)_(2) 0(定义)-|||-^3++3(e)^-arrow Fe -0.04-|||-_(2)+(H)_(2)O+2(e)^-arrow (H{O)_(2)}^-+(OH)^- -0.08-|||-^2++2(e)^-arrow Pb -0.13-|||-(sin )^2++2(e)^-arrow sin -0.14-|||-(Agl+{e)^-arrow arrow Ag+1} -0.15-|||-({N)_(1)}^2++2(e)^-arrow N -0.23-|||-(C{O)^2+}+2(e)^-arrow CO -0.28-|||-^++(e)^-arrow TI -0.34-|||-(O)_(4)+2(e)^-arrow Pb+(S{O)_(4)}^2- -0.36-|||-电极的还原反应 _(0)^theta NN-|||-^3++(e)^-arrow (overrightarrow {i)}^2+ -0.37-|||-^2++2(e)^-arrow Cd -0.40-|||-^3++(e)^-arrow (Cr)^2+ -0.41-|||-^2++2(e)^-arrow Fe -0.44-|||-+2(e)^-arrow (s)^2- -0.48-|||-^3++3(e)^-arrow Cr -0.74-|||-({Z)^2+}+2(e)^-arrow 2n -0.76-|||-(OH)_(2)+2(e)^-arrow Cd+(20H)^- -0.81-|||-(H)_(2)O+2(e)^-arrow (H)_(2)+2(OH)^- -0.83-|||-^2++2(e)^-arrow (Cr) -0.91-|||-^2++2(e)^-arrow Mn -1.18-|||-^2++2(e)^-arrow v -1.19-|||-^2++2(e)^-arrow Ti -1.63-|||-^3++3(e)^-arrow Al -1.66-|||-^3++3(e)^-arrow U -1.79-|||-^3++3(e)^-arrow Se -2.09-|||-^2++2(e)^-arrow Mg -2.36-|||-^3++3(e)^-arrow Ce -2.48-|||-(a)^3++3(e)^-arrow La -2.52-|||-^++(e)^-arrow Na -2.71-|||-^2++2(e)^-arrow Ca -2.87-|||-^2++2(e)^-arrow Sr -2.89-|||-^2++2(e)^-arrow Ba -2.91-|||-^2++2(e)^-arrow Ra -2.92-|||-_(5)^++(e)^-arrow (C)_(5) -2.92-|||-(b)^++(e)^-arrow Rb -2.93-|||-^++(e)^-arrow k -2.93-|||-^++(e)^-arrow Li -3.05-|||-有了标准电极电势表,就可以根据式(8.43)计算电极在不同浓度时的还原电极电势。-|||-表8.4 常用电极的氢标标准还原电极电势(298K)-|||-电极的还原反应 _(00m)N 电极的还原反应 _(0000N)N-|||-_(2)+2(e)^-arrow 2F +2.87 (C{O)_(4)}^-+2(H)^++2(e)^-arrow C(H)_(3)^-+(H)_(2)O +1.23-|||-_(2)(O)_(8)^2-+2(e)^-arrow 2(S{O)_(4)}^2- +2.05 (O)_(2)+4(H)^++2(e)^-arrow (Mn)^2++2(H)_(2)O +1.23-|||-^3++(e)^-arrow (C{O)^2+} +1.81 (F)_(2)+2(e)^-arrow 2(Br)^- +1.09-|||-_(2)(O)_(2)+2(H)^++2(e)^-arrow 2(H)_(2)O +1.78 ({P)_(4)}^4++(e)^-arrow (P{u)^3+} +0.97-|||-^++(e)^-arrow Au +1.69 (N{O)_(3)}^-+4(H)^++3(e)^-arrow NO+2(H)_(2)O +0.96-|||-^4++2(e)^-arrow P(b)^2+ +1.67 ({H)_(2)}^2++2(e)^-arrow (Hg)^2+ +0.92-|||-+2(H)^++2(e)^-arrow (Cl)_(2)+2(H)_(2)O +1.63 ^-+(H)_(2)O+2(e)^-arrow (Cl)^-+2(OH)^- +0.89-|||-+2(H)^++2(e)^-arrow B(r)_(2)+2(H)_(2)O +1.60 ({H)_(2)}^2++2(e)^-arrow Hg +0.86-|||-(O)_(4)^-+8(H)^++5(e)^-arrow (Mn)^2++4(H)_(2)O +1.51 (N{O)_(3)}^-+2(H)^++(e)^-arrow N(O)_(2)+(H)_(2)O +0.80-|||-^3++(e)^-arrow (Mn)^2+ +1.51 ^++(e)^-arrow Ag +0.80-|||-^3++3(e)^-arrow A +1.40 ({H)_(2)}^2++2(e)^-arrow 2(H)_(2) +0.79-|||-_(2)+2(e)^-arrow 2Cl +1.36 ^3++(e)^-arrow (Fe)^2+ +0.77-|||-_(2)(O)_(7)^2-+14(H)^++6(e)^-arrow 2(Cr)^3++7(H)_(2)O +1.33 ^-+(H)_(2)O+2(e)^-arrow B(r)^-+2(OH)^- +0.76-|||-_(2)+4(H)^++4(e)^-arrow 2(H)_(2)O +1.23 Hg2SO4 +2 →2Hg+SO4^(2-) +0.62-|||-EO×Red=EQ,REA-EF/EF InIan^2 (8.43)