Potentiels rédox standard
Mesurés à 25°C
| Élément chimique |
Demi-réaction |
Potentiels standard et
potentiels conditionnels
E° / V |
| Antimoine |
Sb2O5(s) + 6 H+ + 4 e- = 2
SbO+ + 3 H2O |
0,581 |
Argent
|
Ag+ + e- = Ag(s) |
0,799
0,228 (HCl 1M)
0,792 (HClO4 1M)
0,77 (H2SO4 1M) |
| AgBr(s) + e- = Ag(s) + Br- |
0,073 |
| AgCl(s) + e- = Ag(s) + Cl- |
0,222
0,228 (KCl 1M) |
| Ag(CN)2- + e- = Ag(s) + 2 CN- |
-0,31 |
| Ag2CrO4(s) + 2 e- = 2 Ag(s) + CrO42- |
0,446 |
| AgI(s) + e- = Ag(s) + I- |
- 0,151 |
| Ag(S2O3)23- + e- =
Ag(s) + 2 S2O32- |
0,017 |
| Arsenic |
H3AsO4 + 2 H+ + 2 e- = H3AsO3
+ H2O |
0,559
0,577 (HCl, HClO4 1M) |
| Azote |
N2(g) + 5 H+ + 4 e- = N2H5 |
- 0,23 |
| HNO2 + H+ + e- = NO(g) + H2O |
1,00 |
| NO3- + 3 H+ + 2 e- = HNO2
+ H2O |
0,94
0,92 (HNO3 1M) |
| Baryum |
Ba2+ + 2 e- = Ba(s) |
- 2,906 |
| Bismuth |
BiO+ + 2 H+ + 3e- = Bi(s) + H2O |
0,320 |
| BiCl4 + 3 e- = Bi(s) + 4 Cl- |
0,160 |
| Brome |
Br2(l) + 2 e- = 2 Br- |
1,065
1,05 (HCl 4M) |
| Br2(aq) + 2 e- = 2 Br- |
1,087 |
| 2 BrO3- + 12 H+ + 10 e- = Br2(l)
+ 6 H2O |
1,52 |
| BrO3- + 6H+ + 6e- = Br-
+ 3 H2O |
1,44 |
| Cadmium |
Cd2+ + 2 e- = Cd(s) |
- 0,403 |
| Calcium |
Ca2+ + 2 e- = Ca(s) |
- 2,866 |
| Carbone |
C6H4O2 (quinone) + 2 H+ + 2 e-
= C6H4(OH)2 |
0,699
0,696(HCl, HClO4, H2SO4 1M) |
| 2 CO2(g) + 2 H+ + 2 e- = H2C2O4 |
- 0,49 |
| Cérium |
Ce4+ + e- = Ce3+ |
1,70 (HClO4 1M)
1,61 (HNO3 1M)
1,44 (H2SO4 1M) |
| Chlore |
Cl2(g) + 2 e- = 2 Cl- |
1,359 |
| 2 HClO + 2H+ + 2 e- = Cl2(l) + 2 H2O |
1,63 |
| 2 ClO2 + 12 H+ + 10 e- = Cl2(l)
+ 6 H2O |
1,47 |
| Chrome |
Cr2+ + 2 e- = Cr(s) |
- 0,744 |
| Cr3+ + e- = Cr2+ |
- 0,408 |
| Cr2O7-+ 14 H+ + 6 e-
= 2 Cr3+ + 7 H2O |
1,33 |
| Cobalt |
Co2+ + 2 e- = Co(s) |
- 0,277 |
| Co3+ + e- = Co2+ |
1,808 |
| Cuivre |
Cu2+ + 2 e- = Cu(s) |
0,337 |
| Cu2+ + e- = Cu+ |
0,153 |
| Cu+ + e- = Cu(s) |
0,521 |
| Cu2+ + I- + e- = CuI(s) |
0,860 |
| CuI(s) + e- = Cu(s) + I- |
- 0,185 |
| Étain |
Sn2+ + 2 e- = Sn(s) |
- 0,136
- 0,16 (HClO4 1M) |
| Sn4+ + 2 e- = Sn2+ |
0,154
0,14 (HCl 1M) |
| Fer |
Fe2+ + 2 e- = Fe(s) |
- 0,440 |
| Fe3+ + e- = Fe2+ |
0,771
0,700 (HCl 1M)
0,732 (HClO4 1M)
0,68 (H2SO4 1M) |
| Fe(CN)63- + e- = Fe(CN)64-
(HClO4, H2SO4 1M) |
0,36
0,71 (HCl 1M)
0,72 (HClO4, H2SO4 1M) |
| Fluor |
F2(g) + 2 H+ + 2e- = 2 HF(aq) |
3,06 |
| Hydrogène |
2 H+ + 2 e- = H2(g) |
0,000
- 0,005 (HCl, HClO4 1M) |
| Iode |
I2(s) + 2 e- = 2 I- |
0,535 |
| I2(aq) + 2 e- = 2 I- |
0,615 |
| I3- + 2 e- = 3 I- |
0,536 |
| 2 ICl2- + 2 e- = I2(s) + 4 Cl- |
1,056 |
| 2 IO3- + 12 H+ + 10 e- = I2(s)
+ 6 H2O |
1,196 |
| 2 IO3- + 12 H+ + 10 e- = I2(aq)
+ 6 H2O |
1,178 |
| IO3- + 2 Cl- + 6 H+ + 4 e-
= ICl2- + 3 H2O |
1,24 |
| H5IO6 + H+ + 2 e- = IO3-
+ 3 H2O |
1,601 |
| Lithium |
Li+ + e- = Li(s) |
- 3,045 |
| Magnésium |
Mg2+ + 2 e- = Mg(s) |
- 2,363 |
| Manganèse |
Mn2+ + 2 e- = Mn(s) |
- 1,180 |
| Mn3+ + e- = Mn2+ |
1,51 (H2SO4 7,5M) |
| MnO2(s) + 4 H+ + 2 e- = Mn2+
+ 2 H2O |
1,23 |
| MnO4- + 8 H+ + 5 e- = Mn2+
+ 4 H2O |
1,51 |
| MnO4- + 4 H+ + 3 e- = MnO2(s)
+ 2 H2 (g) |
1,695 |
| MnO4- + e- = MnO42- |
0,564 |
| Mercure |
Hg2+ + 2 e- = 2 Hg(l) |
0,788
0,274 (HCl 1M)
0,776 (HClO4 1M)
0,674 (H2SO4 1M) |
| 2 Hg2+ + 2 e- = Hg2+ |
0,920 ; 0,907 (HClO4 1M) |
| Hg2+ + 2 e- = Hg(l) |
0,854 |
| Hg2Cl2(s) + 2 e- = 2 Hg(l) + 2 Cl- |
0,268
0,244 (KCl sat)
0,282 (KCl 1M)
0,334 (KCl 0,1M) |
| Hg2SO4(s) + 2 e- = 2 Hg(l) + 2 SO42- |
0,615 |
| Nickel |
Ni2+ + 2 e- = Ni(s) |
- 0,250 |
| Oxygène |
H2O2 + 2 H+ + 2e- = 2 H2O |
1,776 |
| HO2- + H2O + 2 e- = 3 OH- |
0,88 |
| O2(g) + 4 H+ + 4e- = 2 H2O |
l,229 |
| O2(g) + 2 H+ + 2 e- = H2O2 |
0,682 |
| O3(g) + 2 H+ + 2 e- = O2(g) +
H2O |
2,07 |
| Palladium |
Pd2+ + 2 e- = Pd(s) |
0,987 |
| Platine |
PtCl4- + 2 e- = Pt(s) + 4 Cl- |
0,73 |
| PtCl62- + 2 e- = PtCl42-
+ 2 Cl- |
0,68 |
| Plomb |
Pb2+ + 2 e- = Pb(s) |
- 0,126
- 0,14 (HClO4, H2SO4 1M) |
| PbO2(s) + 4 H+ + 2 e- = Pb2+
+ 2 H2O |
1,455 |
| PbSO4(s) + 2 e- = Pb(s) + SO42- |
- 0,350 |
| Potassium |
K+ + e- = K(s) |
- 2,925 |
| Sélénium |
H2SeO3 + 4 H+ + 4 e- = Se(s)
+ 3 H2O |
0,740 |
| SeO42- + 4 H+ + 2 e- = H2SeO3
+ H2O |
1,15 |
| Sodium |
Na+ + e- = Na(s) |
- 2,714 |
| Soufre |
S(s) + 2 H+ + 2 e- = H2S(g) |
0,141 |
| H2SO3 + 4 H+ + 4 e- = S(s) +
3 H2O |
0,450 |
| SO42- + 4H+ + 2 e- = H2SO3
+ H2O |
0,172 |
| S4O62- + 2 e- = 2 S2O32-
|
0,08 |
| S2O82- + 2 e- = 2 SO42- |
2,01 |
| Thallium |
Tl+ + e- = Tl(s) |
- 0,336
- 0,551 (HCl 1M)
- 0,33 (HClO4, H2SO4 1M) |
| Tl3+ + 2 e- = Tl+ |
1,25
0,77 (HCl 1M) |
| Titane |
Ti3+ + e- = Ti2+ |
- 0,369 |
| TiO+ + 2 H+ + e- = Ti3+ + H2O |
0,099
0,04 (H2SO4 1M) |
| Uranium |
UO22+ + 4 H+ + 2e- = U4+
+ 2 H2O |
0,334 |
| Vanadium |
V3+ + e- = V2+ |
- 0,256
0,21 (HClO4 1M) |
| VO2+ + 2 H+ + e- = V3+ + H2O |
0,359 |
| V(OH)4+ + 2 H+ + e- = VO2+
+ 3 H2O |
1,00
1,02 (HCl, HClO4 1M) |
| Zinc |
Zn2+ + 2 e- = Zn(s) |
- 0,763 |
Bibliographie
- Milazzo G., Caroli S. et Sharma V.K. - Tables of Standard Electrode
Potentials - Wiley, London, 1978.
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