340 



ON THE SURFACE TENSION AND 



The ionization coefficients of the salts in the mixture were 

 determined by Professor MacGregor's* graphical method. The 

 above table contains all the data required for finding them, as 

 Specific gravity measurements showed that even for the strongest 

 solutions the change of volume on mixing was negligible. 



Determination of Ionization Constants. 



In determining the ionization constants (L and I in expression 

 (1) ) for any salt, and for either property, the data for the six 

 weakest solutions examined were in all cases employed ; and the 

 values of the constants were found from these data by the 

 method of least squares. 



The values thus found were employed in calculating the 

 values of the properties of the various mixtures. 



Results of the Caculations. Simple Solutions. 



The following table contains the values of the ionization 

 constants for the various salts and for the two properties investi- 

 gated, with the values of the properties calculated by means of 

 these constants, and the differences between observed and calu- 

 lated values. Concentrations of solutions are expressed in terms 

 of the same units as in Table I. 



TABLE II. SURFACE TENSION AT 15C, (Bother's Observations). 



h Trans. N. S. Inst. Science, IX (1896), p. 101. 



