Section 85. Ionization Values. 



227 



With respect to the change of equivalent conductance with the con- 

 centration, mention need only be made of the fact that the values of the 

 exponent n in the function C(A A) = K(C\) n are about the same 

 for these two salts at 306 as for the other salts previously investigated, 

 namely, 1.44 for ammonium chloride and 1.49 for sodium acetate. In the 

 cases of the base and acid the value of n is approximately 2, as the mass- 

 action law requires (see section 85). 



The equivalent-conductance values for the base and acid (for example, 

 at 100 milli-normal) decrease greatly between 218 and 306 and are 

 less at the latter temperature than at 18. This arises, of course, from 

 a greatly decreased ionization, which overcompensates the increased 

 equivalent conductance of the ions. 



65. IONIZATION VALUES AND THEIR VARIATION WITH THE 

 CONCENTRATION AND TEMPERATURE. 



Table 87 contains the percentage ionization-values for the four sub- 

 stances whose equivalent conductances were given in table 84. These 

 values are simply those of the ratios 100A/A . 



Table S7. Percentage ionization. 



The ionization values for ammonium chloride and sodium acetate even 

 at 306 are only slightly less than those for sodium and potassium chlo- 

 rides, for which in 10 milli-normal solution the values 79.6 and 81.2 per 

 cent were found by Noyes and Coolidge (see table 12, Part II). The 

 ionization of both ammonium hydroxide and acetic acid is seen to have 

 become very much less at the higher temperatures. The separate values 

 of their ionization-constants have already been given in tables 82 and 83. 



