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Chapter: 3 Chemistry
    Section: 3.9 Electrochemistry
        SubSection: 3.9.2 Conductivities

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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 mol1) 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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