T4 



EOYAL SOCIETY OF CANADA 



Data for the Calculations. 



For the simple solutions the ionization coefficients (a) were taken to 

 be equal to the ratios of the specific molecular conductivit}^ to the specific 

 molecular conductivity at infinite dilution. Kohlrausch's values' for the 

 specific molecular conductivity at infinite dilution were used. They were 

 taken to be 1220X10-8. 1030x10-8, 1280 XlQ-^, and 1060 XlO"», for potas- 

 sium chloride, sodium chloride, potassium sulphate, and sodium sulphate, 

 respectively, as determined by him. 



The value of p in the above formula was found by density measure- 

 ments before and after mixing. These measurements were carried out 

 with Ostwald's form of Sprengel's ijyknoraeter. Measurements accurate 

 to 1 in the fourth place could easily be made, this being beyond the degree 

 of accuracy required. The value of^; was found to be practically equal 

 to unity for the most concentrated solutions examined. 



In reading off the dilutions from the curves an error of about 0-1 per 

 <ient might be made. 



Eesults of Observations on Simple Solutions. 



For the purposes of calculation it was necessary to draw curves for 

 «ach salt, showing the relation of dilution to ionic concentration. It was, 

 therefore, necessary to know the concentrations and conductivities of a 

 sufficiently extended series of dilutions of each salt. The following table 

 gives the dilution, conductivity, and concentration of ions of each solution 

 examined. 



The dilutions are expressed in terms of litres ^Jer equivalent gramme- 

 molecule at 18^ C. 



The conductivities are specific molecular conductivities at 18° C, ex- 

 pressed in terms of 10"^ times the specific conductivity of mercury at 0° C. 



The concentrations of ions are the ratios of the sj^ecific molecular con- 

 ductivity to specific molecular conductivity at infinite dilution, divided bj'' 

 the dilution. 



' Wied. Ann., vol. 26, p. 204. 



