Chemistry Reference
In-Depth Information
IV
110
I
(nA)
7
6
60
2-3
1
III
5
II
I
7
4
6
10
-0.8
-0.3
0.2
0.7
1.2
4
1
-40
5
E
(V) vs. Ag
|
ACl
2-3
6
-90
7
V
-140
12.9
Current-potential curves recorded in 1.0 mol l
-
1
H
2
SO
4
solution for
increasing SO
2
concentrations at a carbon-fibre electrode
modified with [Fe(II)TSPc]
4
-
. SO
2
concentrations are (1) 0, (2) 8.34
¥
10
-
5
, (3) 1.00
¥
10
-
4
, (4) 3.37
¥
10
-
4
, (5) 6.42
¥
10
-
4
, (6) 1.21
¥
10
-
3
and
(7) 2.20
¥
10
-
3
mol l
-
1
;
v
=
100 mV s
-
1
.
Table 12.1
Actual fraction of SO
2
, HSO
3
-
and SO
3
2
-
in solution as a function of
pH
C
H
+
(mol l
-
1
)pH Fraction
K
1
K
2
Fraction
Fraction
SO
3
2
-
SO
2
-
HSO
3
-
1.54
¥
10
-
2
1.02
¥
10
-
7
1
0
9.85
¥
10
-
1
1.52
¥
10
-
2
1.55
¥
10
-
9
1.54
¥
10
-
2
1.02
¥
10
-
7
10
-
1
1
8.67
¥
10
-
1
1.33
¥
10
-
1
1.36
¥
10
-
7
1.54
¥
10
-
2
1.02
¥
10
-
7
10
-
2
2
3.94
¥
10
-
1
6.06
¥
10
-
1
6.18
¥
10
-
6
1.54
¥
10
-
2
1.02
¥
10
-
7
10
-
3
3
6.10
¥
10
-
2
9.39
¥
10
-
1
9.58
¥
10
-
5
1.54
¥
10
-
2
1.02
¥
10
-
7
10
-
4
4
6.45
¥
10
-
3
9.93
¥
10
-
1
1.01
¥
10
-
3
1.54
¥
10
-
2
1.02
¥
10
-
7
10
-
5
5
6.42
¥
10
-
4
9.89
¥
10
-
1
1.01
¥
10
-
2
1.54
¥
10
-
2
1.02
¥
10
-
7
10
-
6
6
5.89
¥
10
-
5
9.07
¥
10
-
1
9.26
¥
10
-
2
1.54
¥
10
-
2
1.02
¥
10
-
7
10
-
7
7
3.21
¥
10
-
6
4.95
¥
10
-
1
5.05
¥
10
-
1
1.54
¥
10
-
2
1.02
¥
10
-
7
10
-
8
8
5.80
¥
10
-
8
8.93
¥
10
-
2
9.11
¥
10
-
1
1.54
¥
10
-
2
1.02
¥
10
-
7
10
-
9
9
6.30
¥
10
-
10
9.71
¥
10
-
3
9.90
¥
10
-
1
1.54
¥
10
-
2
1.02
¥
10
-
7
10
-
10
10
6.36
¥
10
-
12
9.79
¥
10
-
4
9.99
¥
10
-
1
for sodium sulphite, which means that in strongly acidic solution, sulphite
is almost completely transformed to SO
2
·
x
H
2
O (Table 12.1). This also
means that k
-1
and k
-2
in Equations 12.11 and 12.12, respectively, are high.
Indeed, by dissolving sodium sulphite in 1.0 mol l
-1
H
2
SO
4
, the typical smell
