34 



Conductivity of Aqueous Solutions. Part XII. 

 Table 141. Percentage ionization. 



As will be seen from table 141 the ionization steadily decreases with 

 rising temperature in the case of every substance investigated. To this 

 principle stated as an entirely general one the only exceptions seem to be 

 water itself up to about 270 and many slightly ionized acids and bases up 

 to about 40, as illustrated by the ionization-constants for acetic acid and 

 ammonium hydroxide tabulated below ; but above this temperature, even 

 such acids and bases also decrease steadily in ionization.* 



The decrease in ionization will, moreover, be seen to be nearly the same 

 for all the largely ionized salts of the same ionic type, so that such salts, 



*Compare also the results of Euler (Z. phys. Chem., 21, 266, 1896) and of Schal- 

 ler (Z. phys. Chem., 25, 517, 1898). 



