106 



HYDRATES IN AQUEOUS SOLUTION. 



lowering produced by chloral hydrate is never much larger than the theo- 

 retical value, and, therefore, this substance does not show any marked 

 hydration at any of the dilutions with which we worked. 



TABLE 87. CHLORAL HYDRATE. 



GLYCEROL. 



The case of glycerol among the non-electrolytes is particularly interesting, 

 in that it shows very marked hydration. This would be indicated by the 

 large molecular lowerings recorded in table 88, and is obvious from the large 

 values of the corrected molecular lowerings, L', under "Hydrates," in that 

 table. The degree of the hydration is shownin column H, under "Hydrates," 

 table 88. We are impressed, first, by the large number of molecules of water 

 combined with one molecule of the glycerol, and, second, by the fact that the 

 complexity of the hydrate increases regularly from the most dilute to the most 

 concentrated solution investigated. The hydrate curve for glycerol is given 

 in fig. 61, where the abscissae represent concentrations, and the ordinates the 

 number of molecules of water combined with one molecule of glycerol. 



TABLE 88. GLYCEROL. 



