438 Lincoln—Electrical Conductivity. 
value of k he finds to be 1.3 for acetone. If this method 
be applied to salts other than KI, the one he employed — to 
Cdl 2 for instance—, it will be found that new values for k will 
be obtained. There is no such agreement between the limiting 
values of /x in acetone and water as Vollmer found to hold in 
the case of ethyl alcohol and water. The two curves for LiCL 
are alike; but the values of /x differ slightly, neither, however,, 
showing any tendency to approach a limiting value. The small 
conductivity Carrara 1 ascribes to the combination of salt and 
solvent which forms LiCl + C 3 H 6 0. 
There have been too few molecular weight determinations of salts 
in ketones made by the boiling point method. This method, ac¬ 
cording to Dutoit andFriderich, 2 yields normal molecular weights 
for the compounds of the formula CNS.NHi, HgCl 2 , Nal, LiCl,, 
and Cdl 2 when dissolved in acetone. In conjunction with the 
electrical conductivity of these solvents, this seems to argue 
against the electrolytic dissociation theory, if the methods em¬ 
ployed are trustworthy means for measuring the amount of dis¬ 
sociation in non-aqueous solutions. But Dutoit and Friderich 
expect soon to show that this is not incompatible with the dis¬ 
sociation theory. 
From the magnitude of the dielectric constants, one would ex¬ 
pect the ketones to yield solutions that conduct. According to 
Ramsay and Shields, their molecules are polymerized. As far 
as measurements have been made, the conductivity has been 
found to increase with the temperature, except in the case of 
Cdl 2 where it remained the same at 50° C as at 25°; but it 
must also be remembered that the molecular conductivity of so¬ 
lutions of this salt does not change with the dilution. 
THE ESTERS. 
In esters the dissociative power is slight, and decreases with 
an increase in the carbon content. The substitution of Cl, CN 
or CH 3 CO for the hydrogen of the methyl group does not cause 
a decrease in the dissociative power of the solvent. Ethyl car- 
1 Loc. cit. 
2 Loc. cit. 
