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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 + 2S 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+ + 2 e Ba −2.912
Be 2+ + 2 e Be −1.847
Br 2 ( a q ) + 2 e 2 Br +1.0873
Ca 2+ + 2 e Ca −2.868
Ce 3 + 3 e Ce −2.483
Ce 4+ + e Ce 3+ +1.61
Cd 2+ + 2 e Cd −0.4030
[ Cd ( CN ) 4 ] 2− + 2 e Cd + 4 CN −1.09
[ Cd ( NH 3 ) 4 ] 2+ + 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 3 O + + 2 e ClO 3 + 3 H 2 O +1.189
ClO 3 + 3 H 3 O + + 2 e HClO 2 + 4 H 2 O +1.21
HClO + H 3 O + + 2 e Cl + 2 H 2 O +1.482
HClO + H 3 O + + e 1 2 Cl 2 + 2 H 2 O +1.611
HClO 2 + 2 H 3 O + + 2 e HClO + 3 H 2 O +1.628
Co 3+ + e Co 2+ ( 2 mol // H 2 SO 4 ) +1.83
Co 2+ + 2 e Co −0.28
[ Co ( NH 3 ) 6 ] 3+ + e [ Co ( NH 3 ) 6 ] 2+ +0.1
Co ( OH ) 3 + e Co ( OH ) 2 + OH +0.17
Cr 3 + 3 e Cr −0.744
Cr 3+ + e Cr 2+ −0.407
Cr 2+ + 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 3 O + + 6 e 2 Cr 3+ + 21 H 2 O +1.232
[ Cr ( OH ) 4 ] + 3 e Cr + 4 OH −1.2
Cr ( OH ) 3 + 3 e Cr + 3 OH −1.48
Cu 2+ + e Cu + +0.153
Cu 2+ + 2 e Cu +0.34
Cu + + e Cu +0.521
F 2 + 2 e 2 F +2.866
Fe 2+ + 2 e Fe −0.447
Fe 3+ + e Fe 2+ +0.771
[ Fe ( CN ) 6 ] 3− + e [ Fe ( CN ) 6 ] 4− +0.36
Fe ( OH ) 2 + 2 e Fe + 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
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 3 O + + 2 e 4 H 2 O +1.776
2 H 3 O + + 2 e H 2 + 2 H 2 O 0.00
HO 2 + H 2 O + 2 e 3 OH +0.878
Hf 4+ + 4 e Hf −1.55
Hg 2+ + 2 e Hg +0.851
2 Hg 2+ + 2 e Hg 2 2+ +0.92
Hg 2 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− + 2e Hg + 4CN −0.37
[ HgI 4 ] 2− + 2e Hg + 4I −0.04
HgS + 2e Hg + S 2− −0.70
I 2 + 2e 2I +0.5355
In 3+ + 3e In −0.3382
K + + e K −2.931
La 3+ + 3e La −2.52
Li + + e Li −3.04
Lu 3+ + 3e Lu −2.28
Mg 2+ + 2e Mg −2.372
Mn 2+ + 2e Mn −1.185
MnO 2 + 2H 2 O + 2e Mn ( OH ) 2 + 2OH −0.05
MnO 4 + 2H 2 O + 3e MnO 2 + 4OH +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 + + e Na −2.71
Nd 3+ + 3e Nd −2.323
Ni 2+ + 2e Ni −0.257
[ Ni ( NH 3 ) 6 ] 2+ + 2e Ni + 6NH 3 −0.49
NiO 2 + 4 H + + 2 e Ni 2+ + 2 H 2 O +1.593
NiO 2 + 2H 2 O + 2e Ni ( OH ) 2 + 2OH +0.49
NiS + 2e 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 + 2e NO 2 + 2OH +0.10
Np 3+ + 3e Np −1.856
O 2 + 2H 2 O + 4e 4OH +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+ + 2e Pb −0.1262
PbO 2 + SO 4 2− + 4 H + + 2 e PbSO 4 + 2 H 2 O +1.69
PbS + 2e Pb + S 2− −0.95
PbSO 4 + 2e Pb + SO 4 2− −0.3505
Pd 2+ + 2e Pd +0.987
[ PdCl 4 ] 2− + 2e Pd + 4Cl +0.591
Pt 2+ + 2e Pt +1.20
[ PtBr 4 ] 2− + 2e Pt + 4Br +0.58
[ PtCl 4 ] 2− + 2e Pt + 4Cl +0.755
[ PtCl 6 ] 2− + 2e [ PtCl 4 ] 2− + 2Cl +0.68
Pu 3 + 3e Pu −2.03
Ra 2+ + 2e Ra −2.92
Rb + + e Rb −2.98
[ RhCl 6 ] 3− + 3e Rh + 6Cl +0.44
S + 2e S 2− −0.47627
S + 2 H + + 2 e H 2 S +0.142
Sc 3+ + 3e Sc −2.09
Se + 2 H + + 2 e H 2 Se −0.399
[ SiF 6 ] 2− + 4e Si + 6F −1.2
SiO 3 2− + 3H 2 O + 4e Si + 6OH −1.697
SiO 2 + 4 H + + 4 e Si + 2 H 2 O −0.86
Sm 3+ + 3e Sm −2.304
Sn 4+ + 2e Sn 2+ +0.151
Sn 2+ + 2e Sn −0.1375
[ SnF 6 ] 2− + 4e Sn + 6F −0.25
SnS + 2e Sn + S 2− −0.94
Sr 2+ + 2e Sr −2.89
TeO 2 + 4 H + + 4 e Te + 2 H 2 O +0.593
Th 4+ + 4e Th −1.90
Ti 2+ + 2e Ti −1.630
U 3+ + 3e U −1.79
V 2+ + 2e V −1.19
Y 3+ + 3e Y −2.37
Zn 2+ + 2e Zn −0.7618
[ Zn ( CN ) 4 ] 2− + 2e Zn + 4CN −1.26
[ Zn ( NH 3 ) 4 ] 2+ + 2e Zn + 4NH 3 −1.04
Zn ( OH ) 2 + 2e Zn + 2OH −1.245
[ Zn ( OH ) 4 ] 2 + 2e Zn + 4OH −1.199
ZnS + 2e Zn + S 2− −1.40
Zr 4 + 4e Zr −1.539

Questions & Answers

what's Thermochemistry
rhoda Reply
the study of the heat energy which is associated with chemical reactions
Kaddija
How was CH4 and o2 was able to produce (Co2)and (H2o
Edafe Reply
explain please
Victory
First twenty elements with their valences
Martine Reply
what is chemistry
asue Reply
what is atom
asue
what is the best way to define periodic table for jamb
Damilola Reply
what is the change of matter from one state to another
Elijah Reply
what is isolation of organic compounds
IKyernum Reply
what is atomic radius
ThankGod Reply
Read Chapter 6, section 5
Dr
Read Chapter 6, section 5
Kareem
Atomic radius is the radius of the atom and is also called the orbital radius
Kareem
atomic radius is the distance between the nucleus of an atom and its valence shell
Amos
Read Chapter 6, section 5
paulino
Bohr's model of the theory atom
Ayom Reply
is there a question?
Dr
when a gas is compressed why it becomes hot?
ATOMIC
It has no oxygen then
Goldyei
read the chapter on thermochemistry...the sections on "PV" work and the First Law of Thermodynamics should help..
Dr
Which element react with water
Mukthar Reply
Mgo
Ibeh
an increase in the pressure of a gas results in the decrease of its
Valentina Reply
definition of the periodic table
Cosmos Reply
What is the lkenes
Da Reply
what were atoms composed of?
Moses Reply
what is chemistry
Imoh Reply
what is chemistry
Damilola

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Source:  OpenStax, Chemistry. OpenStax CNX. May 20, 2015 Download for free at http://legacy.cnx.org/content/col11760/1.9
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