Taula de potencials estàndards de reducció
De Viquipèdia
El potencial estàndard de reducció s'utilitza per determinar el potencial electroquímic o el potencial d'un elèctrode d'una cel·la electroquímica o d'una cel·la galvànica.
Aquests potencials de reducció venen donats en volts respecte d'un elèctrode estàndard d'hidrogen. Els valors dels potencials estàndards de reducció que es presenten a la taula han estat presos a una temperatura de 298 K, una pressió de 100 KPa i en una solució aquosa amb una concentració de 1 mol.[1][2][3][4]
Mitja reacció | E |
---|---|
Li+(aq) + e− → Li(s) | −3.05 |
Rb+(aq) + e− → Rb(s) | −2.98 |
K+(aq) + e− → K(s) | −2.93 |
Cs+(aq) + e− → Cs(s) | −2.92 |
Ba2+(aq) + 2e− → Ba(s) | −2.91 |
Sr2+(aq) + 2e− → Sr(s) | −2.89 |
Ca2+(aq) + 2e− → Ca(s) | −2.76 |
Na+(aq) + e− → Na(s) | −2.71 |
Mg2+(aq) + 2e− → Mg(s) | −2.38 |
H2 + 2e− → 2H− | −2.25 |
Be2+(aq) + 2e− → Be(s) | −1.85 |
Al3+(aq) + 3e− → Al(s) | −1.68 |
Ti2+(aq) + 2e− → Ti(s) | −1.63 |
TiO(s) + 2H+ + 2e− → Ti(s) + H2O | −1.31 |
Ti2O3(s) + 2H+ + 2e− → 2TiO(s) + H2O | −1.23 |
Ti3+(aq) + 3e− → Ti(s) | −1.21 |
Mn2+(aq) + 2e− → Mn(s) | −1.18 |
V2+(aq) + 2e− → V(s) | −1.13 |
Sn(s) + 4H+ + 4e− → SnH4(g) | −1.07 |
SiO2(s) + 4H+ + 4e− → Si(s) + 2H2O | −0.91 |
B(OH)3(aq) + 3H+ + 3e− → B(s) + 3H2O | −0.89 |
TiO2+(aq) + 2H+ + 4e− → Ti(s) + H2O | −0.86 |
2 H2O(l) + 2e– → H2(g) + 2 OH–(aq) | −0.83 |
Zn2+(aq) + 2e− → Zn(s) | −0.76 |
Cr3+(aq) + 3e− → Cr(s) | −0.74 |
Au(CN)2–(aq) + e– → Au(s) +2 CN–(aq) | −0.60 |
2TiO2(s) + 2H+ + 2e− → Ti2O3(s) + H2O | −0.56 |
Ga3+(aq) + 3e− → Ga(s) | −0.53 |
H3PO2(aq) + H+ + e− → P(s) + 2H2O | −0.51 |
H3PO3(aq) + 3H+ + 3e− → P(s) + 3H2O | −0.50 |
H3PO3(aq) + 2H+ + 2e− → H3PO2(aq) + H2O | −0.50 |
Fe2+(aq) + 2e− → Fe(s) | −0.44 |
2CO2(g) + 2H+(aq) + 2e– → HOOCCOOH(aq) | −0.43 |
Cr3+(aq) + e− → Cr2+(aq) | −0.42 |
2H+ + 2e− → H2 | −0.41 |
Cd2+(aq) + 2e− → Cd(s) | −0.40 |
PbSO4(s) + 2e– → Pb(s) +SO42-(aq) | −0.36 |
GeO2(s) + 2H+ + 2e− → GeO(s) + H2O | −0.37 |
In3+(aq) + 3e− → In(s) | −0.34 |
Tl+(aq) + e− → Tl(s) | −0.34 |
Ge(s) + 4H+ + 4e− → GeH4(g) | −0.29 |
Co2+(aq) + 2e → Co(s) | −0.28 |
H3PO4(aq) + 2H+ + 2e− → H3PO3(aq) + H2O | −0.28 |
V3+(aq) + e− → V2+(aq) | −0.26 |
Ni2+(aq) + 2e− → Ni(s) | −0.25 |
As(s) + 3H+ + 3e− → AsH3(g) | −0.23 |
MoO2(s) + 4H+ + 4e− → Mo(s) + 2H2O | −0.15 |
Si(s) + 4H+ + 4e− → SiH4(g) | −0.14 |
Sn2+(aq) + 2e− → Sn(s) | −0.13 |
O2(g) + H+ + e− → HO2•(aq) | −0.13 |
Pb2+(aq) + 2e− → Pb(s) | −0.13 |
WO2(s) + 4H+ + 4e− → W(s) | −0.12 |
CO2(g) + 2H+ + 2e− → HCOOH(aq) | −0.11 |
Se(s) + 2H+ + 2e− → H2Se(g) | −0.11 |
CO2(g) + 2H+ + 2e− → CO(g) + H2O | −0.11 |
SnO(s) + 2H+ + 2e− → Sn(s) + H2O | −0.10 |
SnO2(s) + 2H+ + 2e− → SnO(s) + H2O | −0.09 |
WO3(aq) + 6H+ + 6e− → W(s) | −0.09 |
P(s) + 3H+ + 3e− → PH3(g) | −0.06 |
HCOOH(aq) + 2H+ + 2e− → HCHO(aq) + H2O | −0.03 |
2H+(aq) + 2e− → H2(g) | 0.00 |
H2MoO4(aq) + 6H+ + 6e− → Mo(s) + 4H2O | +0.11 |
Ge4+(aq) + 4e− → Ge(s) | +0.12 |
C(s) + 4H+ + 4e− → CH4(g) | +0.13 |
HCHO(aq) + 2H+ + 2e− → CH3OH(aq) | +0.13 |
S(s) + 2H+ + 2e− → H2S(g) | +0.14 |
Sn4+(aq) + 2e− → Sn2+(aq) | +0.15 |
Cu2+(aq) + e− → Cu+(aq) | +0.16 |
HSO4−(aq) + 3H+ + 2e− → 2H2O(l) + SO2(aq) | +0.16 |
SO42−(aq) + 4H+ + 2e− → 2H2O(l) + SO2(aq) | +0.17 |
SbO+ + 2H+ + 3e− → Sb(s) + H2O | +0.20 |
H3AsO3(aq) + 3H+ + 3e− → As(s) + 3H2O | +0.24 |
GeO(s) + 2H+ + 2e− → Ge(s) + H2O | +0.26 |
Bi3+(aq) + 3e− → Bi(s) | +0.32 |
VO2+(aq) + 2H+ + e− → V3+(aq) | +0.34 |
Cu2+(aq) + 2e− → Cu(s) | +0.34 |
[Fe(CN)6]3−(aq) + e− → [Fe(CN)6]4−(aq) | +0.36 |
O2(g) + 2H2O(l) + 4e– → 4OH–(aq) | +0.40 |
H2MoO4 + 6H+ + 3e− → Mo3+(aq) | +0.43 |
CH3OH(aq) + 2H+ + 2e− → CH4(g) + H2O | +0.50 |
SO2(aq) + 4H+ + 4e− → S(s) + 2H2O | +0.50 |
Cu+(aq) + e− → Cu(s) | +0.52 |
CO(g) + 2H+ + 2e− → C(s) + H2O | +0.52 |
I2(s) + 2e− → 2I−(aq) | +0.54 |
I3−(aq) + 2e− → 3I−(aq) | +0.54 |
[AuI4]−(aq) + 3e− → Au(s) + 4I−(aq) | +0.56 |
H3AsO4(aq) + 2H+ + 2e− → H3AsO3(aq) + H2O | +0.56 |
[AuI2]−(aq) + e− → Au(s) + 2I−(aq) | +0.58 |
MnO4–(aq) + 2H2O(l) + 3e– → MnO2(s) + 4 OH–(aq) | +0.59 |
S2O32− + 6H+ + 4e− → 2S(s) + 3H2O | +0.60 |
H2MoO4(aq) + 2H+ + 2e− → MoO2(s) + 2H2O | +0.65 |
O2(g) + 2H+ + 2e− → H2O2(aq) | +0.70 |
Tl3+(aq) + 3e− → Tl(s) | +0.72 |
H2SeO3(aq) + 4H+ + 4e− → Se(s) + 3H2O | +0.74 |
Fe3+(aq) + e− → Fe2+(aq) | +0.77 |
Hg22+(aq) + 2e− → 2Hg(l) | +0.80 |
Ag+(aq) + e− → Ag(s) | +0.80 |
NO3–(aq) + 2H+(aq) +e– → NO2(g) + H2O(l) | +0.80 |
[AuBr4]−(aq) + 3e− → Au(s) + 4Br−(aq) | +0.85 |
Hg2+(aq) + 2e− → Hg(l) | +0.85 |
MnO4−(aq) + H+ + e− → HMnO4−(aq) | +0.90 |
2Hg2+(aq) + 2e− → Hg22+(aq) | +0.91 |
[AuCl4]−(aq) + 3e− → Au(s) + 4Cl−(aq) | +0.93 |
MnO2(s) + 4H+ + e− → Mn3+(aq) + 2H2O | +0.95 |
[AuBr2]−(aq) + e− → Au(s) + 2Br−(aq) | +0.96 |
Br2(l) + 2e− → 2Br−(aq) | +1.07 |
Br2(aq) + 2e− → 2Br−(aq) | +1.09 |
IO3−(aq) + 5H+ + 4e− → HIO(aq) + 2H2O | +1.13 |
[AuCl2]−(aq) + e− → Au(s) + 2Cl−(aq) | +1.15 |
HSeO4−(aq) + 3H+ + 2e− → H2SeO3(aq) + H2O | +1.15 |
Ag2O(s) + 2H+ + 2e− → 2Ag(s) | +1.17 |
ClO3−(aq) + 2H+ + e− → ClO2(g) + H2O | +1.18 |
ClO2(g) + H+ + e− → HClO2(aq) | +1.19 |
2IO3−(aq) + 12H+ + 10e− → I2(s) + 6H2O | +1.20 |
ClO4−(aq) + 2H+ + 2e− → ClO3−(aq) + H2O | +1.20 |
O2(g) + 4H+ + 4e− → 2H2O | +1.23 |
MnO2(s) + 4H+ + 2e− → Mn2+(aq) + 2H2O | +1.23 |
Tl3+(aq) + 2e− → Tl+(s) | +1.25 |
Cl2(g) + 2e− → 2Cl−(aq) | +1.36 |
Cr2O72−(aq) + 14H+ + 6e− → 2Cr3+(aq) + 7H2O | +1.36 |
CoO2(s) + 4H+ + e− → Co3+(aq) + 2H2O | +1.42 |
2HIO(aq) + 2H+ + 2e− → I2(s) + 2H2O | +1.44 |
BrO3−(aq) + 5H+ + 4e− → HBrO(aq) + 2H2O | +1.45 |
2BrO3− + 12H+ + 10e− → Br2(l) + 6H2O | +1.48 |
2ClO3− + 12H+ + 10e− → Cl2(g) + 6H2O | +1.49 |
MnO4−(aq) + 8H+ + 5e− → Mn2+(aq) + 4H2O | +1.51 |
HO2• + H+ + e− → H2O2(aq) | +1.51 |
Au3+(aq) + 3e− → Au(s) | +1.52 |
NiO2(s) + 4H+ + 2e− → Ni2+(aq) | +1.59 |
2HClO(aq) + 2H+ + 2e− → Cl2(g) + 2H2O | +1.63 |
Ag2O3(s) + 6H+ + 4e− → 2Ag+(aq) + 3H2O | +1.67 |
HClO2(aq) + 2H+ + 2e− → HClO(aq) + H2O | +1.67 |
Pb4+(aq) + 2e− → Pb2+(aq) | +1.69 |
MnO4−(aq) + 4H+ + 3e− → MnO2(s) + 2H2O | +1.70 |
H2O2(aq) + 2H+ + 2e− → 2H2O | +1.76 |
AgO(s) + 2H+ + e− → Ag+(aq) + H2O | +1.77 |
Au+(aq) + e− → Au(s) | +1.83 |
BrO4−(aq) + 2H+ + 2e− → BrO3−(aq) + H2O | +1.85 |
Co3+(aq) + e− → Co2+(aq) | +1.92 |
Ag2+(aq) + e− → Ag+(aq) | +1.98 |
S2O82- + 2e– → 2SO42- | +2.07 |
HMnO4−(aq) + 3H+ + 2e− → MnO2(s) + 2H2O | +2.09 |
F2(g) + 2e− → 2F−(aq) | +2.87 |
F2(g) + 2H+ + 2e− → 2HF(aq) | +3.05 |
[edita] Referències
- ↑ Milazzo, G., Caroli, S., and Sharma, V. K. (1978). Tables of Standard Electrode Potentials (Wiley, Chichester).
- ↑ Bard, A. J., Parsons, R., and Jordan, J. (1985). Standard Potentials in Aqueous Solutions (Marcel Dekker, New York).
- ↑ Bratsch, S. G. (1989). Journal of Physical Chemistry Reference Data Vol. 18, pp. 1–21.
- ↑ Vanysek, Petr (2006). "Electrochemical Series," in Handbook of Chemistry and Physics: 87th Edition (Chemical Rubber Company).
[edita] Vegeu també
- Sèries galvàniques
- Potencial estàndard de reducció