54 ON THE CONDUCTIVITY, SPECIFIC GRAVITY AND 
fully analysed. Seventy-five ec. of a solution was introduced 
into the electrolytic cell, and successive dilutions prepared therein 
by the withdrawal of a certain volume and the addition of an 
equal volume of water at the temperature 18° C. This process 
was continued till the dilution reached that of the next formerly 
prepared solution, when the new one was introduced and the 
same process repeated. After each solution had gone through 
two dilutions the volume removed was analysed, the result 
serving as a check upon the calculated strength of the solution 
in the cell. 
Preparation of Mixtures of Solutions. 
Simple solutions of each electrolyte were prepared and 
analysed. These were kept in the bath till they had taken the 
temperature 18° C.,, when 50 ce. of each solution was removed, 
and the two mixed. The 50 cc. pipette used was thoroughly 
washed with a portion of the solution before the removal. 
Results of Conductivity Observations on Simple Solutions. 
For the purpose of calculating the ionization coefficients of 
the salts in the mixture, it is necessary to draw curves for 
simple solutions of each salt, showing the relation of the dilution 
to the ionic concentration. The following tables give the data 
for the drawing of these curves, obtained from observations on 
the concentrations and conductivities of a number of solutions 
of each salt. 
The dilutions are expressed in terms of litres per gramme 
equivalent at 18° C. The atomic weights used were relative to 
oxygen (16.00) and the same as employed by * Kohlrausch. The 
specific conductivities are those at 18° C, expressed in terms of 
10-4 times Kohlrausch’s new unit (Obm-'em.~?) 
The concentrations of ions are the quotients obtained by 
dividing the specific conductivities by the specific molecular 
conductivities at infinite dilution. * Kohlrausch’s values for the 
specific molecular conductivities at infinite dilution were used, 
namely, for potassium chloride 1312 x 107*, and potassium sul- 
phate, 1350 x 10~*. 
1 Kohl. u. Hol., loc. cit., p. 205, tab. 14. 
2 Tbid., p. 200, tab. & 
