222 



Conductivity of Aqueous Solutions. Part VII. 



cause of this small difference is not known ; but it may be due to a slight 



contamination by carbon dioxide. It may also be mentioned that, when 



corrected to the same concentration, the conductance of ammonium 



chloride solution No. 2 which was made from standardized hydrochloric 



acid and ammonia, agrees almost exactly with that of the other entirely 



independent solutions made from the stock solution of the crystallized salt. 



In tables 82 and 83 are presented in a similar manner the equivalent 



conductances of acetic acid and ammonium hydroxide corrected for the 



impurities in the water and reduced to round temperatures. Two columns 



are, however, added in which are given the ionization-constants Kb or Ka 



for these substances calculated directly from the separate values of the 



A 2 C 



equivalent conductance by the equation r - = Kb or Ka ', for 



(A A)A 



this furnishes the best means of showing the agreement of the results 

 of the different measurements. The A values employed are those derived 

 and tabulated in section 84. In the case of the experiments with ammo- 

 nium hydroxide, solutions 1, 2, 3, 6, and 12 were prepared from Baker 

 and Adamson's purest aqua-ammonia, the others from liquid ammonia, 

 as described in section 78. 



Table 82. Equivalent conductance and ionization-constant of acetic acid at round 



temperatures. 



The mean of all the values at 1S C 

 is 18.36. 



for the concentrations between 210 and 91 milli-normal 



