162 



Conductivity of Aqueous Solutions. Part VI. 



65. CONDUCTIVITY DATA FOR THE SOLUTIONS OF SODIUM HYDROXIDE, 

 AMMONIUM HYDROXIDE, AND AMMONIUM CHLORIDE. 



The following tables contain the direct results of the observations and 

 the equivalent conductances computed therefrom. These original data 

 are presented as a matter of record. All of interest that they contain will 

 be seen in a more obvious way from the summary presented and discussed 

 in the next section. 



The measurements with 20 and 50 milli-normal sodium hydroxide solu- 

 tions are affected by an error arising from the polarization due to the small 

 resistance of these solutions in the bomb. An accurate correction for this 

 error can not be made, but to estimate its magnitude approximately three 

 fairly strong solutions of the base (21, 50, and 75 milli-normal) were 

 measured at 18 both in the bomb and in the U-shaped vessel above 

 referred to and designated cell i or cell n, in which the conductance was 

 only about one-sixtieth as great. The results of these measurements are 

 first presented in table 50.* 



Table 50. Conductivity data for sodium hydroxide in different vessels. 



It is evident from these results that when the conductance in the bomb 

 does not exceed 30,000 X 10~ 6 the difference between the equivalent con- 

 ductance derived from it and that derived from the measurement in the 

 U-shaped cell is inconsiderable ; but that the difference is 0.5 per cent when 

 the conductance is 100,000 X 10" 6 . Although it is uncertain whether this 



*Those on October 19-20, 1904, were made with a solution prepared by diluting 

 stock solution No. 1, which was then three months old. The absolute values are 

 therefore not accurate. 



