44 



HYDRATES IN AQUEOUS SOLUTION. 



POTASSIUM NITRATE. 



The specimen of potassium nitrate was obtained in a fair state of purity. 

 This was recrystallized until it no longer gave a flame-test for sodium. It 

 was then dried for several days at 100 C. in an air-bath, after which it was 

 preserved in a desiccator over calcium chloride until required for use. The 

 mother-solution was made up by direct weighing, and the remaining solu- 

 tions made by dilution. 



TABLE 21. POTASSIUM NITRATE. 



POTASSIUM SULPHATE. 



The specimen of salt used was dried for several days in the air-bath at a 

 temperature of 120 C., and was then preserved in a desiccator over sul- 

 phuric acid until needed. 



TABLE 22. POTASSIUM SULPHATE. 



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



tZtschr. phys. Chem., II, 527 (1893). 



