226 



Conductivity of Aqueous Solutions. Part VII. 



For the sake of comparison the values obtained by other workers in 

 this laboratory are here tabulated. 



*Kohlrausch found 126.2. 



It is of interest to consider the change with the temperature of the 

 A -values for ammonium chloride and sodium acetate, taken in combi- 

 nation with the results of Noyes and Kato (table 59, Part VI) and of 

 Noyes and Cooper, table 40, Part V). The values of AA/At for the 

 successive temperature-intervals are given in table 85 ; and the ratio of 

 their A -values to those of potassium chloride and sodium chloride at 

 the same temperature are given in table 86. 



Table 85. Temperature-coefficients of the equivalent conduct- 

 ance at zero concentration (AA/A;). 



It will be seen from these tables that the A -values for ammonium 

 chloride increase with the temperature in nearly the same way as do those 

 for potassium chloride, there being two points of inflexion in the con- 

 ductance-temperature curve, namely, between 100 and 218, and 218 and 

 306. For sodium acetate, on the contrary, the rate of increase with the 

 temperature becomes steadily greater up to 218. The equivalent conduct- 

 ance of the acetate ion, however, steadily approaches that of the chloride 

 ion (except through the interval 218- 300 where the slight decrease in 

 the ratio for sodium acetate to sodium chloride may be due to error). 



