432 
Lincoln—Electrical Gonductivity. 
From the analogy of the electrolytic dissociation of sub¬ 
stances in aqueous solutions to the dissociation of gases, 
Ostwald has formulated a law of dilution for binary electrolytes 
which is as follows:— 
K = 
(1 -a)V' 
Mv 
M oo 
and V is the volume in which one gram molecule of the 
dissolved substance is contained. In aqueous solutions of 
weak electrolytes this generally holds fairly well, and many 
attempts have been made to determine whether it holds for 
non-aqueous solutions. Most investigators, Volimer, Woelfer, 
Cattaneo, and others, have found that Ostwald’s dilution law 
does not hold in the case of methyl and ethyl alcoholic solu¬ 
tions. Cohen 1 has considered this subject at considerable 
length, and comes to the same conclusion. 
The following table compiled from the work of Volimer and 
of Woelfer shows more clearly in the case of ethyl alcoholic 
solutions that the K in the above formula is not constant. 
Table XXXIII. 
From Vollmer’s conductivity determinations. 
Potassium Acetate. 
Lithium Chloride. 
Sodium Iodide. 
V 
a 
lOOiT 
V 
a 
100 AT 
V 
a 
100 JV 
11.4 
0.264 
0.83 
5.9 
0.328 
2.70 
8.7 
0.474 
4.92 
113.0 
0.549 
0.59 
60.5 
0.621 
1.68 
27.4 
0.580 
2.92 
1120.0 
0.862 
0.48 
605.0 
0.858 
0.86 
280. 
0.805 
1.19 
3520.0 
0.934 
0.36 
1912.0 
0.934 
0.69 
2800. 
0.934 
0.47 
From Woelfer’s boiling point determinations. 
Potassium Acetate. 
Lithium Chloride. 
Sodium Iodide. 
V 
a 
100 K 
V 
a 
100 JT 
V 
a 
100 K 
6 0 
0.077 
0.11 
2.6 
0.178 
1.5 
9.1 
0.289 
1.3 
6.9 
0.100 
0.16 
3.0 
0.205 
1.8 
10.4 
0.317 
1.4 
8.0 
0.126 
0.22 
3.5 
0.240 
2.2 
12.2 
0.353 
1.6 
9.7 
0.160 
0.31 
4.2 
0.277 
2.5 
14.7 
0.391 
1.7 
12.2 
0.195 
0.39 
5.3 
0.325 
2.9 
18.4 
0.438 
1.8 
16.2 
0.249 
0.50 
7.0 
0.381 
3.4 
24.6 
0.495 
1.9 
24.4 
0.324 
0.64 
10.6 
0.472 
4.0 
37.0 
0.574 
2.1 
48.4 
0.441 
0.71 
21.1 
0.600 
4.3 
74.0 
0.718 
2.4 
1 Loc. cit. 
