AQUEOUS SOLUTIONS. AKCHIBALD. 301 



mixture can be taken to be exactly the same as the value found 

 by observations on the simple solutions only in the case of 

 infinitely dilute mixtures. 



The fact that for mixtures of nearly saturated solutions of 

 these salts, the difference between the calculated and observed 

 values is only 1.47 per cent, while for solutions of KC1 and NaCl 

 as near saturation, the difference is about 5 per cent, as deter- 

 mined by MacGregor* and again by Mclntosh*, would seem to 

 indicate that in the case of this class of salts, the magnitude of 

 the differences depends on the amount of salt in the solution, 

 not on the nearness to saturation. 



It would appear from the above results that for mixtures of 

 solutions of these salts not more concentrated than 0.8 equiva- 

 lent gramme-molecules per litre, it is possible, by the aid of the 

 dissociation theory, to calculate the conductivity within, or but 

 little beyond, the limit of the error of observation. 



*Loc. cit. 



