98 



HYDRATES IN AQUEOUS SOLUTION. 

 TABLE 77. SULPHURIC ACID Continued. 



CHROMIC ACID. 



Chromic acid gives large freezing-point lowerings at all of the dilutions 

 studied and, not being very highly dissociated, it therefore has great power 

 to form hydrates. As Ostwald pointed out, chromic acid exists in solution 

 in the form of dichromic acid, the hydrogen ions effecting the transforma- 

 tion. The amount of combined water increases regularly with the con- 

 centration (see fig. 56), and the amount of water in combination with one 

 molecule of the acid increases, in general, with the dilution of the solution. 



