96 



HYDRATES IN AQUEOUS SOLUTION. 



NITRIC ACID. 



The results with nitric acid are of the same general character as those 

 with hydrochloric and hydrobromic acids. The freezing-point lowerings 

 are, however, less in the case of nitric acid, and, since the dissociation is 

 about the same, the hydrating power is smaller. Like hydrochloric and 

 hydrobromic acids, dilute solutions of nitric acid seem to form no hydrates. 

 Not until about 0.7 N is reached is there manifested any appreciable power 

 to combine with water. The total amount of water combined with the 

 acid increases with the concentration up to the most concentrated solution. 

 The number of molecules of water in combination with one molecule of the 

 acid increases from about 0.7 N, with the concentration, to about 4 N, and 

 then begins to decrease with further increase in the concentration. 



TABLE 76. NITRIC ACID. 



