Media reacción E o ( V) Li + (aq) + e − → Li(s) −3.0 5 Rb + (aq) + e − → Rb(s) −2.9 8 K + (aq) + e − → K(s) −2.9 3 Cs + (aq) + e − → Cs(s) −2.9 2 Ba 2+ (aq) + 2e − → Ba(s) −2.9 1 Sr 2+ (aq) + 2e − → Sr(s) −2.8 9 Ca 2+ (aq) + 2e − → Ca(s) −2.7 6 Na + (aq) + e − → Na(s) −2.7 1 Mg 2+ (aq) + 2e − → Mg(s) −2.3 8 H 2 + 2e − → 2H − −2.2 5 Be 2+ (aq) + 2e − → Be(s) −1.8 5 Al 3+ (aq) + 3e − → Al(s) −1.6 8 Ti 2+ (aq) + 2e − → Ti(s) −1.6 3 TiO(s) + 2H + + 2e − → Ti(s) + H 2 O −1.3 1 Ti 2 O 3 (s) + 2H + + 2e − → 2TiO(s) + H 2 O −1.2 3 Ti 3+ (aq) + 3e − → Ti(s) −1.2 1 Mn 2+ (aq) + 2e − → Mn(s) −1.1 8 V 2+ (aq) + 2e − → V(s) −1.1 3 Sn(s) + 4H + + 4e − → SnH 4 (g) −1.0 7 SiO 2 (s) + 4H + + 4e − → Si(s) + 2H 2 O −0.9 1 B(OH) 3 (aq) + 3H + + 3e − → B(s) + 3H 2 O −0.8 9 TiO 2+ (aq) + 2H + + 4e − → Ti(s) + H 2 O −0.8 6 2 H 2 O(l) + 2e – → H 2 (g) + 2 OH – (aq) −0.8 3 Zn 2+ (aq) + 2e − → Zn(s) −0.7 6 Cr 3+ (aq) + 3e − → Cr(s) −0.7 4 Au(CN) 2 – (aq) + e – → Au(s) +2 CN – (aq) −0.6 0 2TiO 2 (s) + 2H+ + 2e − → Ti 2 O 3 (s) + H 2 O −0.5 6 Ga 3+ (aq) + 3e − → Ga(s) −0.5

Media Reacción

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Media reacción Eo (V)Li+(aq) + e− → Li(s) −3.05Rb+(aq) + e− → Rb(s) −2.98K+(aq) + e− → K(s) −2.93Cs+(aq) + e− → Cs(s) −2.92Ba2+(aq) + 2e− → Ba(s) −2.91Sr2+(aq) + 2e− → Sr(s) −2.89Ca2+(aq) + 2e− → Ca(s) −2.76Na+(aq) + e− → Na(s) −2.71Mg2+(aq) + 2e− → Mg(s) −2.38H2 + 2e− → 2H− −2.25Be2+(aq) + 2e− → Be(s) −1.85Al3+(aq) + 3e− → Al(s) −1.68Ti2+(aq) + 2e− → Ti(s) −1.63TiO(s) + 2H+ + 2e− → Ti(s) + H2O −1.31Ti2O3(s) + 2H+ + 2e− → 2TiO(s) + H2O −1.23Ti3+(aq) + 3e− → Ti(s) −1.21Mn2+(aq) + 2e− → Mn(s) −1.18V2+(aq) + 2e− → V(s) −1.13Sn(s) + 4H+ + 4e− → SnH4(g) −1.07SiO2(s) + 4H+ + 4e− → Si(s) + 2H2O −0.91B(OH)3(aq) + 3H+ + 3e− → B(s) + 3H2O −0.89TiO2+(aq) + 2H+ + 4e− → Ti(s) + H2O −0.862 H2O(l) + 2e– → H2(g) + 2 OH–(aq) −0.83Zn2+(aq) + 2e− → Zn(s) −0.76Cr3+(aq) + 3e− → Cr(s) −0.74Au(CN)2

–(aq) + e– → Au(s) +2 CN–(aq) −0.602TiO2(s) + 2H+ + 2e− → Ti2O3(s) + H2O −0.56Ga3+(aq) + 3e− → Ga(s) −0.53H3PO2(aq) + H+ + e− → P(s) + 2H2O −0.51H3PO3(aq) + 3H+ + 3e− → P(s) + 3H2O −0.50H3PO3(aq) + 2H+ + 2e− → H3PO2(aq) + H2O −0.50Fe2+(aq) + 2e− → Fe(s) −0.442CO2(g) + 2H+(aq) + 2e– → HOOCCOOH(aq) −0.43Cr3+(aq) + e− → Cr2+(aq) −0.422H+ + 2e− → H2 −0.41Cd2+(aq) + 2e− → Cd(s) −0.40PbSO4(s) + 2e– → Pb(s) +SO4

2-(aq) −0.36GeO2(s) + 2H+ + 2e− → GeO(s) + H2O −0.37In3+(aq) + 3e− → In(s) −0.34Tl+(aq) + e− → Tl(s) −0.34Ge(s) + 4H+ + 4e− → GeH4(g) −0.29Co2+(aq) + 2e → Co(s) −0.28H3PO4(aq) + 2H+ + 2e− → H3PO3(aq) + H2O −0.28V3+(aq) + e− → V2+(aq) −0.26Ni2+(aq) + 2e− → Ni(s) −0.25As(s) + 3H+ + 3e− → AsH3(g) −0.23MoO2(s) + 4H+ + 4e− → Mo(s) + 2H2O −0.15Si(s) + 4H+ + 4e− → SiH4(g) −0.14Sn2+(aq) + 2e− → Sn(s) −0.13O2(g) + H+ + e− → HO2

•(aq) −0.13Pb2+(aq) + 2e− → Pb(s) −0.13WO2(s) + 4H+ + 4e− → W(s) −0.12CO2(g) + 2H+ + 2e− → HCOOH(aq) −0.11Se(s) + 2H+ + 2e− → H2Se(g) −0.11CO2(g) + 2H+ + 2e− → CO(g) + H2O −0.11SnO(s) + 2H+ + 2e− → Sn(s) + H2O −0.10SnO2(s) + 2H+ + 2e− → SnO(s) + H2O −0.09WO3(aq) + 6H+ + 6e− → W(s) −0.09P(s) + 3H+ + 3e− → PH3(g) −0.06HCOOH(aq) + 2H+ + 2e− → HCHO(aq) + H2O −0.032H+(aq) + 2e− → H2(g) 0.00H2MoO4(aq) + 6H+ + 6e− → Mo(s) + 4H2O +0.11Ge4+(aq) + 4e− → Ge(s) +0.12C(s) + 4H+ + 4e− → CH4(g) +0.13HCHO(aq) + 2H+ + 2e− → CH3OH(aq) +0.13