reduction potentials

Half-Reaction H 2 O 2 +2H +2e → 2H 2 O + – PbO 2 +4H + +SO 4 2– + 2e – → PbSO 4 +2H 2 O E° (V) 1.78 1.69 M nO +4H...

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Half-Reaction H 2 O 2 +2H +2e → 2H 2 O +



PbO 2 +4H + +SO 4

2–

+ 2e – → PbSO 4 +2H 2 O

E° (V) 1.78

1.69

M nO +4H +3e → M nO 2 +2H 2 O

1.68

M nO +8H +5e → M n +4H 2 O

1.51

PbO 2 + 4H + 2e → Pb +2H 2 O

1.46

Cl 2 +2e → 2Cl

1.36

– 4

+

– 4



+



+

2+





2+



O 2 +4H + +4e – → 2H 2 O

1.23

Br 2 +2e → 2Br

1.09





NO 3– +4H + +3e – → NO +2H 2 O

0.96

Ag + +e – → Ag

0.80

I 2 +2e → 2I

0.54





Cu +e → Cu +



0.52

O 2 +2H 2 O+4e → 4OH –



Hg 2 Cl 2 +2e → 2Hg+2Cl –

0.40 –

0.34

Cu 2+ +2e – → Cu

0.34

SO +4H +2e → H 2SO 3 +H 2 O

0.20

Cu 2+ +e – → Cu +

0.16

2H +2e → H 2

0.00

Fe +3e → Fe

–0.036

Pb +2e → Pb

–0.13

Sn +2e → Sn

–0.14

2– 4

+

+





3+



2+





2+

Ni 2+ +2e – → Ni PbSO 4 +2e → Pb+SO –

–0.23 2– 4

–0.35

Cd 2+ +2e – → Cd

–0.40

Fe +2e → Fe

–0.44

Cr 3+ +3e – → Cr

–0.73

2+



Zn +2e → Zn 2+



2H 2 O+2e → H 2 +2OH –

M n +2e → M n 2+

Al

3+



+ 3e → Al –

–0.76 –

–0.83 –1.18 –1.66

M g 2+ +2e – → M g

–2.37

Na +e → Na

–2.71

Ca 2+ +2e – → Ca

–2.76

K +e → K

–2.92

Li + +e – → Li

–3.05

+

+





NCDPI Reference Tables for Chemistry (adopted 2000)

Increasing strength as reducing agent

Standard Reduction Table 25°C

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