THE INJURY CURRENT OF NERVE 
3 2 3 
'The degree of dissociation of a substance in a solution is equal to the ratio of the 
equivalent conductivity of that solution to its equivalent conductivity at infinite 
dilution.' 1 Fortunately, tabulated lists of such equivalent conductivities obtained by 
the experimental work of many investigators, have been prepared by Fitzpatrick., 2 
to which we may conveniently refer (the same lists are also found as an appendix to 
Whethams' Solution and Electrolysis). From these lists the following data have been 
collected and used in the determination of the dissociation constants : — 
Electrolyte 
Molecular conductivity 
of the ' equivalent ' 
solution 
Molecular conductivity 
at infinite dilution 
■ 
Dissociation 
constant 
NaCl 
695 
IO24. 
•68 
KC1 
919 
I 2 I 6 
75 
NH + CI 
907 
1215 
75 
\ (BaCl 4 ) 
658 
1 
•58 
h ( MgClz ) 
631* 
IOJO* 
•59 
h (CaCl,) 
633 
IO43 
•60 
LiCl 
59 1 
965 
•61 
The normal solution of NaCl therefore used in the experiments of the preceding 
section, did not, as we have formerly represented it, contain one equivalent gramme 
molecule per litre of important material, but only "68 of this. 
k 
The value of ' k' obtained from the result, - = 1*42, is not k = 1*42, 
n 
since ' n ' is not equal to 1, but to -68, 
.-. k = 1-42 x -68 
= '97 
The values of 'k' obtained fbr each of the other electrolytes has similarly to be 
corrected by the use of the dissociation constants given above, the results of this 
correction are given on following- page. 
1. Le Blanc, Electro-chemistry, 87, transl. 
2. British Association Reports, 1893. 
