36 



HYDRATES IN AQUEOUS SOLUTION. 



SODIUM NITRATE. 



The sample of sodium nitrate used was purified by repeated crystalliza- 

 tions. The purified salt was dried at 110 C. in an air-bath, and preserved 

 over calcium chloride in a desiccator until required. The mother-solution 

 was made up by direct weighing, and the other solutions obtained from 

 this by dilution. 



TABLE 9. SODIUM NITRATE. 



SODIUM SULPHATE. 



The salt used was heated to 120 C. for several days, and was then 

 removed from the air-bath and finely pulverized. 



TABLE 10. SODIUM SULPHATE. 



* Phys. Rev., 3, 277 (1896). 



