Section 8y. Summary. 235 



In this article have also been presented determinations of the degree 

 01 hydrolysis of ammonium acetate at 218 and 306. This has been 

 derived from measurements of the change in conductance produced when 

 to the solution of the neutral salt acetic acid or ammonium hydroxide is 

 added. In 0.01 normal solution the pure salt was found to be 53 per 

 cent hydrolyzed at 218 and 91 per cent at 30G, while it can be shown 

 by calculation to be only 0.35 per cent hydrolyzed at 18 ; thus showing 

 the enormous effect of temperature in increasing the hydrolysis of salts. 



From the hydrolysis and ionization of the ammonium acetate and from 

 the ionization-constants of the acid and base the ionization of water itself 

 at 218 and 306 has been calculated. The final results together with 

 those obtained at lower temperatures by the previous workers in this 

 laboratory, are as follows. The values show the equivalents of hvdrogen- 

 ion or hydroxide-ion present in ten million liters of pure water. 



100 156 218 306 



6.9 14.9 21.5 13.0 



The considerable increase between 100 and 218 and the decrease 

 between 218 and 306, indicating a maximum between these temperatures, 

 will be noted. 



