IV. ON THE CALCULATION OF THE CONDUCTIVITY OF. AQUEOUS 

 SOLUTIONS CONTAINING THE CHLORIDES OF SODIUM 

 AND BARIUM. BY T. C. McKAY, B. A., Dalfiousie 

 College, Halifax, N. S. 



(Read Ikth March 1898.) 



The object of this research was to test the possibility of 

 calculating the conductivity of mixtures of solutions of the 

 chlorides of sodium and barium by means of the dissociation 

 theory of electrolytic conduction. It was undertaken at the 

 suggestion of Prof. J. G. MacGregor, and was conducted in the 

 Physical and Chemical Laboratories of Dalhousie College. 



The method of calculation is fully described in one of Prof . 

 MacGregor's papers.* It may suffice here to state that by a 

 graphical treatment of the dilutions and ionic concentrations of 

 series of simple solutions of the two electrolytes, the magnitude 

 of the dilution of each salt, in the portion or region of a 

 mixture which it may be supposed to occupy, can be found, 

 together with the common value of the concentration of ions of 

 the electrolytes in their respective regions. These having been 

 found, their products give the ionizatipn coefficients in the 

 mixture, and the conductivity of the mixture is then obtained 

 from the expression of the dissociation theory for the conduc- 

 tivity, viz. : 



+ v ) 



where the te's represent the ionization coefficients of the electro- 

 lytes in the mixture, the ris the concentrations of the constituent 

 solutions (in gramme-equivalents per litre), the v's the volumes 

 of the constituent solutions, the few's the specific molecular con- 

 ductivities (i. e., per gramme-equivalent) at infinite dilution, of 

 the electrolytes in the mixture, and p the ratio of the volume of 

 the mixture to the sum of the volumes of the constituent solu- 



* N. S. Inst. of Sci., Trasactions, Vol. ix, p. 101. 



(321) 



