BARNES. 115 
OF AQUEOUS SOLUTIONS. 
The observations of Reyher, Wagner and Kanitz were made 
on somewhat stronger solutions than those for which the above 
expressions might be expected to.hold, but they were considered 
as probably sufficiently dilute to warrant the expectation of an 
approximate applicability of the expressions. 
Simple Solutions. 
For the determination of the ionization constants in expres- 
sions (1) and (2), one must know the ionization coefficients for 
the four solutions examined in the case of each salt by Reyher 
and Wagner. Unfortunately all the observations on the vis- 
cosity of these salts were made at 25° C., while all the available 
conductivity data, from which the ionization coefficients are 
obtained, were at 18°C., and thus it was necessary either to 
reduce the viscosity values from 25° to 18° or the conductivity 
values from 18° to 25°. This latter reduction was carried out, 
as data for the former were not available. This involved 
much work; because for the determination of the ionization 
coetlicients at 25°, it was necessary to obtain both the specific 
molecular conductivity at 25° and the specitic molecular con- 
ductivity at infinite dilution for 25°. 
Determination of the Specific Molecular Conductivity at 
Infinite Dilution for 25°C. 
The value of the specific molecular conductivity at infinite 
dilution for 25° for each salt was obtained from } Kohlrausch’s 
value at 18° by aid of ?Déguisne’s data. These data were 
employed in obtaining the specific molecular conductivity at 
25° from the values at 18°, for the three weakest solutions 
given in *® Kohlrausch’s and Déeuisne’s tables; and the ratio 
DB Ne 5 
Mes Fs was then determined, where #,, and py, are the 
a) 
specific molecular conductivity at 25° and 18° respectively. 
Table I gives the values thus obtained. The concentrations 
are expressed in gramme-equivalents per litre, and the specific 
molecular conductivities in terms of this unit and of 10-4 times 
*Kohlrausch’s new unit of conductivity (ohm—! em.—?). 
1 Kohl. u. Holb., loc. cit., p. 200, tab. 8. 
2 Tbid., p. 195, tab. 7. 
3 Ibid., pp. 159, 160, tab. 2. 
4 Ibid., p. 1. 
