330 THOMPSON YATES LABORATORIES REPORT 
So far as the examination of the action of solutions of potassium chloride has 
been carried, the 'concentration law,' as determined in the preceding sections, holds 
good, and serves to combine the results obtained. The range of concentrations 
examined has been, it will be acknowledged, fairly extensive, from 7.45 grammes 
per cent, to 0^745 grammes per cent. The whole range of concentrations used, with the 
exception of the last example, however, is above that of the isotonic solution. 
In the following table the average results of these experiments with different 
concentrations of potassium chloride solution are arranged. The comparison, so 
facilitated, will be found to amply vindicate the truth of the 'concentration law.' 
Average Results Tabulated 
Concentration of the Solution 
The dissociation 
constant at 
this concentration 
The Ratio between 
The genera 
Law ' as 
' Concentration 
defined by the 
In grammes per 
cent. 
In gramme 
equivalent molecules 
per litre 
the Final and 
Initial Potential 
Differences 
data from each special case 
(value of ' n ' corrected 
by the use of the 
dissociation constant) 
(«) 
745 
I 
•68 
log. 1-30 
Eco 
Ea 
log. J57 
n 
(b) 
372 
1 
2 
78 
» 274 
I 07 
77 
n 
(c) 
186 
1 
4 
85 
» 414 
77 
•85 
77 
n 
{d) 
186 
1 
5 
■85 
» 476 
77 
•82 
n 
(e) 
0745 
1 
10 
•86 
„ 1050 
) 7 
•91 
77 
n 
The general agreement is shown by the last column of the preceding table. It 
will be seen to be in marked contrast to the results obtained from the action of 
solutions much below the ' isotonic solution ' in concentration, as shewn by the expern 
ments collected in the following tables. A glance at the '745 KC1 table will show 
how great the individual exceptions are which are found at this concentration. 
The truth of the law is here only indicated by an appeal to the average result 
obtained : which is, however, conclusive. Such an appeal to an average is only of 
value when no liberty is retained to eliminate undesirable cases from the list, and 
this method has been strictly followed in the -745 table. It has also been strictly 
adhered to in tabulating the results obtained with solutions still more dilute than 
the isotonic, the results of which are given in the two following tables. 
