24 



HYDRATES IN AQUEOUS SOLUTION. 



with this substance, to see if some error had not found its way into this 

 part of the work, and the results are given later. 



The nitrates of a number of metals, each containing 6 molecules of water 

 of crystallization, give lowerings of the freezing-point of the same order of 

 magnitude, and the curves for these substances fall very closely together on 

 the figure. 



16 



Concentration 

 FIG. 17. 



The nitrates of aluminium, iron, and chromium are of special interest, 

 in that these substances contain more water of crystallization than any 

 others thus far studied in this work. They not only show much greater 

 lowering of the freezing-point than the nitrates with 6 molecules of crystal 

 water, but show a greater lowering of the freezing-point of water than any 

 other salts that we have thus far investigated. A careful study of this 



