Standard Electrode (Half-Cell) Potentials

A Collective Work

Appendices

Standard Electrode (Half-Cell) Potentials

Half-Reaction

E° (V)

Ag^{+} + e^{-} ⟶ Ag

+0.7996

AgCl + e^{-} ⟶ Ag + Cl^{-}

+0.22233

[Ag (CN)_{2}]^{-} + e^{-} ⟶ Ag + 2 CN^{-}

–0.31

Ag_{2} CrO_{4} + 2 e^{-} ⟶ 2 Ag + CrO_{4}^{2 -}

+0.45

[Ag (NH_{3})_{2}]^{+} + e^{-} ⟶ Ag + 2 NH_{3}

+0.373

[Ag (S_{2} O_{3})_{2}]^{3 +} + e^{-} ⟶ Ag + 2 S_{2} O_{3}^{2 -}

+0.017

[AlF_{6}]^{3 -} + 3 e^{-} ⟶ Al + 6 F^{-}

–2.07

Al^{3 +} + 3 e^{-} ⟶ Al

–1.662

Am^{3 +} + 3 e^{-} ⟶ Am

–2.048

Au^{3 +} + 3 e^{-} ⟶ Au

+1.498

Au^{+} + e^{-} ⟶ Au

+1.692

Ba^{+} + 2 e^{-} ⟶ Ba

–2.912

Be^{+} + 2 e^{-} ⟶ Be

–1.847

Br_{2} (a q) + 2 e^{-} ⟶ 2 Br^{-}

+1.0873

Ca^{+} + 2 e^{-} ⟶ Ca

–2.868

Ce^{3} + 3 e^{-} ⟶ Ce

–2.483

Ce^{4 +} + e^{-} ⟶ Ce^{3 +}

+1.61

Cd^{+} + 2 e^{-} ⟶ Cd

–0.4030

[Cd (CN)_{4}]^{2 -} + 2 e^{-} ⟶ Cd + 4 CN^{-}

–1.09

[Cd (NH_{3})_{4}]^{+} + 2 e^{-} ⟶ Cd + 4 NH_{3}

–0.61

CdS + 2 e^{-} ⟶ Cd + S^{2 -}

–1.17

Cl_{2} + 2 e^{-} ⟶ 2 Cl^{-}

+1.35827

ClO_{4}^{-} + H_{2} O + 2 e^{-} ⟶ ClO_{3}^{-} + 2 OH^{-}

+0.36

ClO_{3}^{-} + H_{2} O + 2 e^{-} ⟶ ClO_{2}^{-} + 2 OH^{-}

+0.33

ClO_{2}^{-} + H_{2} O + 2 e^{-} ⟶ ClO^{-} + 2 OH^{-}

+0.66

ClO^{-} + H_{2} O + 2 e^{-} ⟶ Cl^{-} + 2 OH^{-}

+0.89

ClO_{4}^{-} + 2 H^{+} + 2 e^{-} ⟶ ClO_{3}^{-} + H_{2} O

+1.189

ClO_{3}^{-} + 3 H^{+} + 2 e^{-} ⟶ HClO_{2} + H_{2} O

+1.21

HClO + H^{+} + 2 e^{-} ⟶ Cl^{-} + H_{2} O

+1.482

HClO + H^{+} + e^{-} ⟶ \frac{1}{2} Cl_{2} + H_{2} O

+1.611

HClO_{2} + 2 H^{+} + 2 e^{-} ⟶ HClO + H_{2} O

+1.628

Co^{3 +} + e^{-} ⟶ Co^{+} (2 mol // H_{2} SO_{4})

+1.83

Co^{+} + 2 e^{-} ⟶ Co

–0.28

[Co (NH_{3})_{6}]^{3 +} + e^{-} ⟶ [Co (NH_{3})_{6}]^{+}

+0.1

Co (OH)_{3} + e^{-} ⟶ Co (OH)_{2} + OH^{-}

+0.17

Cr^{3} + 3 e^{-} ⟶ Cr

–0.744

Cr^{3 +} + e^{-} ⟶ Cr^{+}

–0.407

Cr^{+} + 2 e^{-} ⟶ Cr

–0.913

[Cu (CN)_{2}]^{-} + e^{-} ⟶ Cu + 2 CN^{-}

–0.43

CrO_{4}^{2 -} + 4 H_{2} O + 3 e^{-} ⟶ Cr (OH)_{3} + 5 OH^{-}

–0.13

{Cr}_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} \to 2 {Cr}^{3 +} + 7 H_{2} O

$Cr_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} ⟶ 2 Cr^{3 +} + 7 H_{2} O$

+1.232

[Cr (OH)_{4}]^{-} + 3 e^{-} ⟶ Cr + 4 OH^{-}

–1.2

Cr (OH)_{3} + 3 e^{-} ⟶ 3 OH^{-}

–1.48

Cu^{+} + e^{-} ⟶ Cu^{+}

+0.153

Cu^{+} + 2 e^{-} ⟶ Cu

+0.34

Cu^{+} + e^{-} ⟶ Cu

+0.521

F_{2} + 2 e^{-} ⟶ 2 F^{-}

+2.866

Fe^{+} + 2 e^{-} ⟶ Fe

–0.447

Fe^{3 +} + e^{-} ⟶ Fe^{+}

+0.771

[Fe (CN)_{6}]^{3 -} + e^{-} ⟶ [Fe (CN)_{6}]^{4 -}

+0.36

Fe (OH)_{2} + 2 e^{-} ⟶ 2 OH^{-}

–0.88

FeS + 2 e^{-} ⟶ Fe + S^{2 -}

–1.01

Ga^{3 +} + 3 e^{-} ⟶ Ga

–0.549

Gd^{3 +} + 3 e^{-} ⟶ Gd

–2.279

\frac{1}{2} H_{2} + e^{-} ⟶ H^{-}

–2.23

2 H_{2} O + 2 e^{-} ⟶ H_{2} + 2 OH^{-}

–0.8277

H_{2} O_{2} + 2 H^{+} + 2 e^{-} ⟶ 2 H_{2} O

+1.776

2 H^{+} + 2 e^{-} ⟶ H_{2}

0.00

HO_{2}^{-} + H_{2} O + 2 e^{-} ⟶ 3 OH^{-}

+0.878

Hf^{4 +} + 4 e^{-} ⟶ Hf

–1.55

Hg^{+} + 2 e^{-} ⟶ Hg

+0.851

2 Hg^{+} + 2 e^{-} ⟶ Hg_{2}^{+}

+0.92

Hg_{2}^{+} + 2 e^{-} ⟶ 2 Hg

+0.7973

[HgBr_{4}]^{2 -} + 2 e^{-} ⟶ Hg + 4 Br^{-}

+0.21

Hg_{2} Cl_{2} + 2 e^{-} ⟶ 2 Hg + 2 Cl^{-}

+0.26808

[Hg (CN)_{4}]^{2 -} + 2 e^{-} ⟶ Hg + 4 CN^{-}

–0.37

[HgI_{4}]^{2 -} + 2 e^{-} ⟶ Hg + 4 I^{-}

–0.04

HgS + 2 e^{-} ⟶ Hg + S^{2 -}

–0.70

I_{2} + 2 e^{-} ⟶ 2 I^{-}

+0.5355

In^{3 +} + 3 e^{-} ⟶ In

–0.3382

K^{+} + e^{-} ⟶ K

–2.931

La^{3 +} + 3 e^{-} ⟶ La

–2.52

Li^{+} + e^{-} ⟶ Li

–3.04

Lu^{3 +} + 3 e^{-} ⟶ Lu

–2.28

Mg^{+} + 2 e^{-} ⟶ Mg

–2.372

Mn^{+} + 2 e^{-} ⟶ Mn

–1.185

MnO_{2} + 2 H_{2} O + 2 e^{-} ⟶ Mn (OH)_{2} + 2 OH^{-}

–0.05

MnO_{4}^{-} + 2 H_{2} O + 3 e^{-} ⟶ MnO_{2} + 4 OH^{-}

+0.558

MnO_{2} + 4 H^{+} + 2 e^{-} ⟶ Mn^{2 +} + 2 H_{2} O

+1.23

MnO_{4}^{-} + 8 H^{+} + 5 e^{-} ⟶ Mn^{2 +} + 4 H_{2} O

+1.507

Na^{+} + 3 e^{-} ⟶ Na

–2.71

Nd^{3 +} + 3 e^{-} ⟶ Nd

–2.323

Ni^{+} + 2 e^{-} ⟶ Ni

–0.257

[Ni (NH_{3})_{6}]^{+} + 2 e^{-} ⟶ Ni + 6 NH_{3}

–0.49

NiO_{2} + 4 H^{+} + 2 e^{-} ⟶ Ni^{2 +} + 2 H_{2} O

+1.593

NiO_{2} + 2 H_{2} O + 2 e^{-} ⟶ Ni (OH)_{2} + 2 OH^{-}

+0.49

NiS + 2 e^{-} ⟶ Ni + S^{2 -}

+0.76

NO_{3}^{-} + 4 H^{+} + 3 e^{-} ⟶ NO + 2 H_{2} O

+0.957

NO_{3}^{-} + 3 H^{+} + 2 e^{-} ⟶ HNO_{2} + H_{2} O

+0.92

NO_{3}^{-} + H_{2} O + 2 e^{-} ⟶ NO_{2}^{-} + 2 OH^{-}

+0.10

Np^{3} + 3 e^{-} ⟶ Np

–1.856

O_{2} + 2 H_{2} O + 4 e^{-} ⟶ 4 OH^{-}

+0.401

O_{2} + 2 H^{+} + 2 e^{-} ⟶ H_{2} O_{2}

+0.695

O_{2} + 4 H^{+} + 4 e^{-} ⟶ 2 H_{2} O

+1.229

Pb^{+} + 2 e^{-} ⟶ Pb

–0.1262

PbO_{2} + SO_{4}^{2 -} + 4 H^{+} + 2 e^{-} ⟶ PbSO_{4} + 2 H_{2} O

+1.69

PbS + 2 e^{-} ⟶ Pb + S^{2 -}

–0.95

PbSO_{4} + 2 e^{-} ⟶ Pb + SO4^{2 -}

–0.3505

Pd^{+} + 2 e^{-} ⟶ Pd

+0.987

[PdCl_{4}]^{2 -} + 2 e^{-} ⟶ Pd + 4 Cl^{-}

+0.591

Pt^{+} + 2 e^{-} ⟶ Pt

+1.20

[PtBr_{4}]^{2 -} + 2 e^{-} ⟶ Pt + 4 Br^{-}

+0.58

[PtCl_{4}]^{2 -} + 2 e^{-} ⟶ Pt + 4 Cl^{-}

+0.755

[PtCl_{6}]^{2 -} + 2 e^{-} ⟶ [PtCl_{4}]^{2 -} + 2 Cl^{-}

+0.68

Pu^{3} + 3 e^{-} ⟶ Pu

–2.03

Ra^{+} + 2 e^{-} ⟶ Ra

–2.92

Rb^{+} + e^{-} ⟶ Rb

–2.98

[RhCl_{6}]^{3 -} + 3 e^{-} ⟶ Rh + 6 Cl^{-}

+0.44

S + 2 e^{-} ⟶ S^{2 -}

–0.47627

S + 2 H^{+} + 2 e^{-} ⟶ H_{2} S

+0.142

Sc^{3 +} + 3 e^{-} ⟶ Sc

–2.09

Se + 2 H^{+} + 2 e^{-} ⟶ H_{2} Se

–0.399

[SiF_{6}]^{2 -} + 4 e^{-} ⟶ Si + 6 F^{-}

–1.2

SiO_{3}^{2 -} + 3 H_{2} O + 4 e^{-} ⟶ Si + 6 OH^{-}

–1.697

SiO_{2} + 4 H^{+} + 4 e^{-} ⟶ Si + 2 H_{2} O

–0.86

Sm^{3 +} + 3 e^{-} ⟶ Sm

–2.304

Sn^{4 +} + 2 e^{-} ⟶ Sn^{+}

+0.151

Sn^{+} + 2 e^{-} ⟶ Sn

–0.1375

[SnF_{6}]^{2 -} + 4 e^{-} ⟶ Sn + 6 F^{-}

–0.25

SnS + 2 e^{-} ⟶ Sn + S^{2 -}

–0.94

Sr^{+} + 2 e^{-} ⟶ Sr

–2.89

TeO_{2} + 4 H^{+} + 4 e^{-} ⟶ Te + 2 H_{2} O

+0.593

Th^{4 +} + 4 e^{-} ⟶ Th

–1.90

Ti^{+} + 2 e^{-} ⟶ Ti

–1.630

U^{3 +} + 3 e^{-} ⟶ U

–1.79

V^{+} + 2 e^{-} ⟶ V

–1.19

Y^{3 +} + 3 e^{-} ⟶ Y

–2.37

Zn^{+} + 2 e^{-} ⟶ Zn

–0.7618

[Zn (CN)_{4}]^{2 -} + 2 e^{-} ⟶ Zn + 4 CN^{-}

–1.26

[Zn (NH_{3})_{4}]^{+} + 2 e^{-} ⟶ Zn + 4 NH_{3}

–1.04

Zn (OH)_{2} + 2 e^{-} ⟶ Zn + 2 OH^{-}

–1.245

[Zn (OH)_{4}]^{2} + 2 e^{-} ⟶ Zn + 4 OH^{-}

–1.199

ZnS + 2 e^{-} ⟶ Zn + S^{2 -}

–1.40

Zr^{4} + 4 e^{-} ⟶ Zr

–1.539

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