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3.9.2 Conductivities
Molar conductivities (S cm2
mol−1) of electrolytes in aqueous solution at 25 °C
In the following table the entities to which the mole
relates are given in the first column, e.g.
 MgCl2 (not MgCl2). The values are taken
from Harned and Owen (1958). The original data have been converted from (int.
ohm)−1 cm−1 where 1 int. ohm = 1.000 49
ohm.
|
Electrolyte |
c/(mol dm−3) |
|
|
0 |
0.0005 |
0.001 |
0.005 |
0.01 |
0.02 |
0.05 |
0.1 |
|
|
|
|
|
|
|
|
|
|
|
HCl . . . . . |
425.95 |
422.53 |
421.15 |
415.60 |
411.80 |
407.04 |
398.89 |
391.13 |
|
LiCl . . . . . |
114.97 |
113.09 |
112.34 |
109.35 |
107.27 |
104.60 |
100.06 |
95.81 |
|
NaCl. . . . . |
126.39 |
124.44 |
123.68 |
120.59 |
118.45 |
115.70 |
111.01 |
106.69 |
|
KCl. . . . . |
149.79 |
147.74 |
146.88 |
143.48 |
141.20 |
138.27 |
133.30 |
128.90 |
|
NH4Cl . . . . |
149.6 |
— |
146.7 |
143.4 |
141.21 |
138.26 |
133.22 |
128.69 |
|
KBr . . . . . |
151.8 |
— |
— |
146.02 |
143.36 |
140.41 |
135.61 |
131.32 |
|
NaI . . . .
. |
126.88 |
125.30 |
124.19 |
121.19 |
119.18 |
116.64 |
112.73 |
108.73 |
|
KI . .
. . |
150.31 |
— |
— |
144.30 |
142.11 |
139.38 |
134.90 |
131.05 |
|
KNO3 . .
. |
144.89 |
142.70 |
141.77 |
138.41 |
135.75 |
132.34 |
126.25 |
120.34 |
|
KHCO3 . . . |
117.94 |
116.04 |
115.28 |
112.18 |
110.03 |
107.17 |
— |
— |
|
NaOOC.CH3 . |
91.0 |
89.2 |
88.5 |
85.68 |
83.72 |
81.20 |
76.88 |
72.76 |
|
NaOH . . . |
247.7 |
245.5 |
244.6 |
240.7 |
237.9 |
— |
— |
— |
|
AgNO3 . .
. |
133.29 |
131.30 |
130.45 |
127.14 |
124.70 |
121.35 |
115.18 |
109.09 |
|
 MgCl2 .
.
|
129.34 |
125.55 |
124.05 |
118.25 |
114.49 |
109.99 |
103.03 |
97.05 |
|
CaCl2 . .
. |
135.77 |
131.87 |
130.30 |
124.19 |
120.30 |
115.59 |
108.42 |
102.41 |
|
SrCl2 .
. . |
135.73 |
131.84 |
130.27 |
124.18 |
120.23 |
115.48 |
108.20 |
102.14 |
|
BaCl2 . .
. |
139.91 |
135.89 |
134.27 |
127.96 |
123.88 |
119.03 |
111.42 |
105.14 |
|
Na2SO4 .
. |
129.8 |
125.68 |
124.09 |
117.09 |
112.38 |
106.73 |
97.70 |
89.94 |
|
CuSO4 .
. |
133.5 |
121.5 |
115.20 |
94.02 |
83.08 |
74.16 |
59.02 |
50.55 |
|
ZnSO4 . . |
132.7 |
121.3 |
115.41 |
95.44 |
84.87 |
72.20 |
61.17 |
52.61 |
|
 LaCl3 . .
.
|
145.7 |
139.5 |
136.9 |
127.4 |
121.7 |
115.2 |
106.1 |
99.1 |
|
K3Fe(CN)6 . |
174.4 |
166.3 |
163.0 |
150.6 |
— |
— |
— |
— |
|
 K4Fe(CN)6 .
|
184.4 |
— |
167.16 |
146.02 |
134.76 |
122.76 |
107.65 |
97.82 |
There are extensive tables of conductivity data for aqueous solutions in
Lobo (1989).
Ionic conductivities
(Λ°/S cm2
mol−1) at infinite dilution at 25
°C
The values in the table are taken from Robinson and Stokes (1970),
corrected from international ohm−1.
|
Cation |
Λ° |
Cation |
Λ° |
Anion |
Δ° |
Anion |
Λ° |
|
H+
. . . |
349.6 |
Mg2+ . .
. |
53.0 |
OH− .
. . |
199.0 |
HCO
. . . |
54.6 |
|
Li+
. . . |
38.7 |
Ca2+ . .
. |
59.5 |
Cl− .
. . |
76.3 |
CH3CO
. . . |
40.9 |
|
Na+ .
. . |
50.1 |
Sr2+ .
. . |
59.4 |
Br− .
. . |
78.1 |
CO
. . . |
69.3 |
|
K+
. . . |
73.5 |
Ba2+ . .
. |
63.6 |
I−
. . . |
76.8 |
C2O
. . . |
74.1 |
|
NH .
. . |
73.6 |
Cu2+ . .
. |
53.6 |
NO .
. |
71.4 |
SO .
. . |
80.0 |
|
Ag+ .
. . |
61.9 |
Zn2+ . .
. |
52.8 |
ClO
. . |
67.3 |
Fe(CN)
. . . |
100.9 |
|
Tl+
. . . |
74.7 |
La3+ . .
. |
69.7 |
HCO
. . |
44.5 |
Fe(CN)
. . . |
110.4 |
References
Y.-C. Chiu and R. M. Fuoss (1968) J. Phys. Chem., 72,
4123.
H. S. Harned and B. B. Owen (1958) Physical Chemistry of
Electrolytic Solutions, 3rd edn, Appendix A, 697, Reinhold, New York.
G. Jones and B. C. Bradshaw (1933) J. Amer. Chem. Soc, 55,
1799.
V. M. M. Lobo (1989) Handbook of Electrolyte Solutions, Parts A
and B, Elsevier, Amsterdam.
R. A. Robinson and R. H. Stokes (1970)
Electrolyte Solutions, 2nd revised edn, 463 and 465, Butterworth,
London.
Y. C. Wu, K. W. Pratt and W. F. Koch (1989) J.
Solution Chem., 18, 515.
A.K. Covington
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