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
vii