OF CERTAIN ORGANIC ACIDS IN AQUEOUS SOLUTIONS. 55 



in the anions have the smallest JJL X values. A curve in which the 

 ordinates represent the y.*, values of the acids, and abscissas the 

 number of the atoms, was plotted for all these acids. 1 By placing the 

 dibasic acids on this curve according to the number of atoms present, 

 their values were obtained. (See fig. 20.) 



The values for the acids marked with an asterisk (*) in table 16 

 were determined by other workers in this laboratory, and can be found 

 in publication No. 170 of the Carnegie Institution of Washington, 

 pages 91 and 92. It was shown that acids having the same number 



TABLE 16. Limiting conductivities of the acids. 



of atoms in the molecule have practically the same AU value. From 

 these values and the others given in the table just referred to the curve 

 was, therefore, plotted. On this curve it was possible to find the values 

 of /-too for the dibasic acid by means of the graphic method previously 

 described. The curve shows that at the higher temperatures the method 

 is far less accurate, since the values which are determined directly, 

 using the sodium salt, fall less frequently on a definite curve at the 

 higher temperatures. 



'Carnegie Inst. Wash. Pub. No. 170. 



