174 



Conductivity of Aqueous Solutions. Part VI. 

 Table 59. Equivalent conductance at round concentrations. 



The values (A ) for zero concentration or complete ionization have been 

 calculated for ammonium chloride and for sodium hydroxide except at 

 218 by the graphical method which has been used throughout this series 

 of investigations and is described in section 17, Part II. Since in the 

 case of ammonium chloride the data did not suffice to determine the value 

 of the exponent n, this was assumed to be the same as for potassium 

 chloride, namely, 1.42. The results with sodium hydroxide at 218 are 

 not accurate nor extensive enough to make this method reliable. The 

 value of A at 218 given in the table is an estimated one derived from 

 the value of A at the lower temperatures and from the corresponding 

 A values for sodium chloride and hydrochloric acid in the way described 

 in section 84, Part VII. 



The values of A for ammonium hydroxide have been calculated by add- 

 ing to the difference between the values for ammonium chloride and 

 sodium chloride that for sodium hydroxide. The values for sodium chloride 

 used were those given by Noyes and Coolidge, section 16, Part II, namely, 

 109.0 at 18, 362 at 100 and 555 at 156. The A values for ammonium 

 hydroxide at 51.0, 75.2 and 124.8 were interpolated graphically between 

 those at the other three temperatures, and are less accurate than the values 

 at the other temperatures. The concentrations are expressed in milli- 

 equivalents per liter of solution. 



The values given for ammonium acetate at 18 and 100 are based on 

 the specific conductance values for the unhydrolyzed salt given below 



