COMPLEX SOLUTIONS ARCHIBALD. 39 



^unexpected that I thought it well to repeat the observations, 

 the result being substantiated by the repetition. 



It will be seen also that in both cases the coefficients reach 

 constant values as concentration is diminished, in the case of 

 \ K 2 SO 4 from a concentration of '0004 on, in that of \ Na 2 S0 4 

 from "0006 on. Assuming then that theee values will hold for 

 infinite dilution, the equivalent conductivities at infinite dilution 

 for C. may be determined from Kohlrausch's values* for 18C, 

 Viz., 1270xlO- 8 and 1070xlO- 8 for |K 2 S0 4 and \ Na 2 S0 4 

 respectively. They were found thus to have the values 800 X 

 10~ 8 and 646 X 10 8 respectively, expressed in terms of the 

 conductivity of mercury at 0C. 



Determination of the lonization coefficients of simple 



solutions. 



Both for the purpose of finding how closely the lowering of 

 the freezing point could be calculated for simple solutions and 

 for the purpose of determining the ionization coefficients of the 

 electrolytes in the mixtures, it was necessary to know the 

 ionization coefficients of a sufficiently extended series of simple 

 solutions of the two electrolytes. The following table contains 

 the observations of conductivity made for this purpose, together 

 with the values of the ionization coefficients calculated on the 

 assumption that for simple solutions they are equal to the ratios 

 of the equivalent conductivity to the equivalent conductivity at 

 at infinite dilution. The table gives also the ionization coeffi- 

 cients at 18C. obtained from the conductivity observations 

 of former papers, f These quantities 'are not needed for 

 the present purpose. But the knowledge of the ionization 

 coefficients at enables us to determine how in the case of 

 the electrolytes under consideration the state of ionization 

 in simple solutions varies with the temperature. Concen- 

 tions and conductivities are expressed in terms of the same units 

 as in Table I. 



*Wied. Ann., 50, 406, (1893). 



t Trans. N. S. Inst. Sci., 9, 291 and 307, (1897-8.) 



