Interactions | Reactions | Processes

Classified as: Reduction Half Reaction

The electrochemical reduction of a species by Single Electron Transfer from an electrode can be assigned a voltage with respect to a standard hydrogen electrode.

During a reduction half reaction a species gains one or more electrons and these appear of the left hand side of the equation. By convention, redox half reactions are compared as the reduction half reaction.

For more information look in the Chemogenesis webbook sections on redox chemistry and substitution, transfer, abstraction, displacement (STAD).

Al3+
  +  
3
e–
         
Al

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Sb
  +  
3
H+
  +  
3
e–
         
H3Sb

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As
  +  
3
H+
  +  
3
e–
         
H3As

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Ba2+
  +  
2
e–
         
Ba

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Be2+
  +  
2
e–
         
Be

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2
HOBr
  +  
2
H+
  +  
2
e–
         
Br2
  +  
2
H2O

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Br2
  +  
2
e–
         
2
Br–

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Cd2+
  +  
2
e–
         
Cd

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Cs+
  +  
e–
         
Cs

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Ca2+
  +  
2
e–
         
Ca

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CO2
  +  
2
H+
  +  
2
e–
         
CO
  +  
H2O

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CO2
  +  
2
H+
  +  
2
e–
         
HCOOH

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2
CO2
  +  
2
H+
  +  
2
e–
         

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Ce4+
  +  
e–
         
Ce3+

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Ce3+
  +  
3
e–
         
Ce

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2
HClO
  +  
2
H+
  +  
2
e–
         
Cl2
  +  
2
H2O

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Cl2
  +  
2
e–
         
2
Cl–

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[Cr2O7]2–
  +  
14
H+
  +  
6
e–
         
2
Cr3+
  +  
7
H2O

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Cr3+
  +  
e–
         
Cr2+

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Cr3+
  +  
3
e–
         
Cr

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Cr2+
  +  
2
e–
         
Cr

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Co3+
  +  
e–
         
Co2+

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Co2+
  +  
2
e–
         
Co

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Cu2+
  +  
e–
         
Cu+

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Cu2+
  +  
Cl–
  +  
e–
         
CuCl

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Cu2+
  +  
2
e–
         
Cu

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Cu+
  +  
e–
         
Cu

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CuCl
  +  
e–
         
Cu
  +  
Cl–

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F2
  +  
2
e–
         
2
F–

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Ga3+
  +  
2
e–
         
Ga+

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Ga3+
  +  
3
e–
         
Ga

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Ga2+
  +  
2
e–
         
Ge

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Au3+
  +  
2
e–
         
Au+

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Au+
  +  
e–
         
Au

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2
H+
  +  
2
e–
         
H2

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HOOH
  +  
2
H+
  +  
2
e–
         
2
H2O

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In3+
  +  
2
e–
         
In+

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In+
  +  
e–
         
In

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2
[IO3]–
  +  
12
H+
  +  
10
e–
         
I2
  +  
6
H2O

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2
[IO]–
  +  
4
H+
  +  
2
e–
         
I2
  +  
2
H2O

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I2
  +  
2
e–
  +  
H2O
         
2
I–

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Fe3+
  +  
e–
         
Fe2+

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Fe3+
  +  
3
e–
         
Fe

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Fe2+
  +  
2
e–
         
Fe

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La3+
  +  
3
e–
         

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Pb4+
  +  
2
e–
         
Pb2+

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PbO2
  +  
4
H+
  +  
2
e–
         
Pb2+
  +  
2
H2O

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PbO2
  +  
4
H+
         
Pb4+
  +  
2
H2O

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Pb2+
  +  
2
e–
         

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PbO
  +  
2
H+
  +  
2
e–
         
  +  
H2O

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PbSO4
  +  
2
e–
         
  +  
[SO4]2–

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Li+
  +  
e–
         
Li

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Mg2+
  +  
2
e–
         
Mg

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[MnO4]–
  +  
4
H+
  +  
3
e–
         
MnO2
  +  
2
H2O

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[MnO4]–
  +  
8
H+
  +  
5
e–
         
Mg2+
  +  
4
H2O

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MnO2
  +  
4
H+
  +  
2
e–
         
Mg2+
  +  
2
H2O

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Mg2+
  +  
2
e–
         
Mn

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2
Hg2+
  +  
2
e–
         
Hg23+

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Hg2+
  +  
2
e–
         
Hg

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Hg23+
  +  
2
e–
         
2
Hg

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Hg2Cl2
  +  
2
e–
         
2
Hg
  +  
2
Cl–

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Ni2+
  +  
2
e–
         
Ni

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2
[NO3]–
  +  
4
H+
  +  
2
e–
         
N2O4
  +  
2
H2O

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[NO3]–
  +  
3
H+
  +  
2
e–
         
HNO2
  +  
H2O

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[NO3]–
  +  
4
H+
  +  
3
e–
         
NO
  +  
2
H2O

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[NO3]–
  +  
10
H+
  +  
8
e–
         
[NH4]+
  +  
3
H2O

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HNO2
  +  
H+
  +  
e–
         
NO
  +  
H2O

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2
NO2
  +  
8
H+
  +  
8
e–
         
N2
  +  
4
H2O

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3
N2
  +  
2
H+
  +  
2
e–
         
2
HN3

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O2
  +  
4
H+
  +  
4
e–
         
2
H2O

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O2
  +  
2
H+
  +  
2
e–
         
HOOH

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O2
  +  
2
H2O
  +  
4
e–
         
4
[OH]–

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O3
  +  
2
H+
  +  
2
e–
         
O2
  +  
H2O

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Pd2+
  +  
2
e–
         
Pd

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H3PO4
  +  
2
H+
  +  
2
e–
         
H3PO3
  +  
H2O

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H3PO3
  +  
2
H+
  +  
2
e–
         
H3PO2
  +  
H2O

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4
H3PO2
  +  
4
H+
  +  
4
e–
         
P
  +  
8
H2O

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P
  +  
12
H+
  +  
12
e–
         
4
PH3

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Pt2+
  +  
2
e–
         
Pt

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K+
  +  
e–
         
K

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Rb+
  +  
e–
         
Rb

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Se
  +  
2
H+
  +  
2
e–
         
H2Se

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Se
  +  
2
e–
         
Se2–

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SiO2
  +  
4
H+
  +  
4
e–
         
Si
  +  
2
H2O

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Si
  +  
4
H+
  +  
4
e–
         
SiH4

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Ag+
  +  
e–
         
Ag

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Ag2O
  +  
2
H+
  +  
2
e–
         
2
Ag
  +  
H2O

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AgCl
  +  
e–
         
Ag
  +  
Cl–

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Na+
  +  
e–
         
Na

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Sr2+
  +  
2
e–
         
Sr

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[SO4]2–
  +  
4
H+
  +  
2
e–
         
H2SO3
  +  
H2O

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H2SO3
  +  
4
H+
  +  
4
e–
         
S
  +  
3
H2O

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S
  +  
2
e–
         
S2–

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S
  +  
2
H+
  +  
2
e–
         
H2S

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Te
  +  
2
e–
         
Te2–

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Tl3+
  +  
2
e–
         
Tl+

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Tl+
  +  
e–
         
Tl

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Sn4+
  +  
2
e–
         
Sn2+

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Sn2+
  +  
2
e–
         
Sn

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Ti3+
  +  
e–
         
Ti2+

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Ti2+
  +  
2
e–
         
Ti

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U4+
  +  
e–
         
U3+

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U3+
  +  
3
e–
         
U

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V3+
  +  
e–
         
V2+

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V2+
  +  
2
e–
         
V

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Zn2+
  +  
2
e–
         
Zn

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H2SO4
  +  
2
e–
  +  
2
H+
         
SO2
  +  
2
H2O

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2
  +  
2
e–
  +  
2
H+
         

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[Cr(H2O)6]2+
  +  
e–
         

[Cr(H2O)6]2+

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[MnO4]–
  +  
5
e–
  +  
8
H+
  +  
2
H2O
         

[Mn(H2O)6]2+

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  +  
e–
         

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[ClO]–
  +  
2
H+
  +  
2
e–
         
Cl–
  +  
H2O

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[NO3]–
  +  
2
H+
  +  
e–
         
NO2
  +  
H2O

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[SO4]2–
  +  
4
H+
  +  
2
e–
         
SO2
  +  
2
H2O

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O2
  +  
4
e–
         
2
O2–

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H2SO4
  +  
8
H+
  +  
8
e–
         
H2S
  +  
4
H2O

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[SO4]2–
  +  
10
H+
  +  
8
e–
         
H2S
  +  
4
H2O

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[ClO3]–
  +  
6
H+
  +  
6
e–
         
Cl–
  +  
3
H2O

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  +  
2
e–
         
2

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[VO2]+
[VO(H2O)5]3+
  +  
e–
  +  
2
H+
  +  
4
H2O
         

[VO]2+
[VO(H2O)5]2+

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[VO]2+
[VO(H2O)5]2+
  +  
e–
  +  
2
H+
         
V3+
  +  
6
H2O

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© Mark R. Leach 1999 –

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please contact Mark R. Leach, the author, using mark@meta-synthesis.com