94 



HYDRATES IN AQUEOUS SOLUTION. 



TABLE 74. HYDROCHLORIC ACID Continued. 



HYDROBROMIC ACID. 



The hydrobromic acid was kindly prepared for us by Professor Renouf. 

 A fairly wide range of concentrations was investigated. The results were 

 very similar in character to those obtained with hydrochloric acid. The 

 solutions up to about 0.3 N show no hydration. The hydration from this 

 point to the most concentrated solution investigated, is of the same order 

 as for hydrochloric acid (see fig. 56). The number of molecules of water 

 in combination with one molecule of the acid is of the same magnitude with 

 hydrobromic as with hydrochloric acid. It increases from about 0.3 N 

 to 2 N, and then decreases up to the most concentrated solution used. The 

 meaning of this rather surprising fact will be pointed out in the general 

 discussion of the results. 



