118 



Studies on Solution. 



Table 99 contains the probable values of A at 25 for the organic 

 acids, calculated in the manner just indicated. 



TABLE 99. 



SUMMARY. 



The authors have prepared absolute alcohol solutions of 32 sodium 

 salts of organic acids, and have measured the electrical conductance of 

 these solutions at 15, 25, and 35, over a concentration range extend- 

 ing from N/50 to N/20000. Five of the salts had been previously 

 studied by Goldschmidt and his pupils, and our results present a 

 striking confirmation of their data. 



The A values for the salts can not be obtained experimentally, 

 although they may be closely approached in many instances; they must 

 therefore be obtained by some method of extrapolation. Goldschmidt 

 used the Kohlrausch formula 



In common with Turner and with Dutoit and Rappeport we have been 

 unable to get satisfactory results with this formula. We have been 

 entirely successful, however, in the use of a function developed for 

 aqueous solutions by A. A. Noyes and J. Johnston: 



By means of this function we have obtained the A values at 25 for 

 all of the salts which have been studied. By combining these values 

 with A HC1 and A NaCl we have been able to calculate the limiting 

 conductance at 25 of 31 organic acids in absolute alcohol solution. 

 These A values, in the case of the 5 acids studied also by Goldschmidt, 

 are uniformly lower than those obtained by the latter. 



With a knowledge of the A values of the organic acids, it will be 

 possible to estimate the dissociation and affinity constants of these 

 acids in absolute alcohol solution. 



