CADMIUM SULPHATE. 



73 



CADMIUM SULPHATE. 

 TABLE 54. CADMIUM SULPHATE. 



MANGANESE CHLORIDE. 



The substances dealt with in the few following pages were studied by 

 Jones and Getman* in their earlier work. At that time the evidence for 

 the existence of hydrates in solution was not recognized as clearly as it is 

 to-day, and no effort was then made to calculate the composition of the 

 hydrates formed by these compounds. Jones and Bassett have taken the 

 earlier data as far as they bear on the problem in hand, and have supple- 

 mented them wherever necessary, in order to calculate the approximate 

 composition of the hydrates formed by these various substances, at different 

 concentrations. This necessitated many new freezing-point determinations; 

 in all cases new conductivity measurements at 0; and the specific gravities 

 of all of the solutions had to be ascertained. 



An examination of table 55 will show that manganese chloride resembles 

 the chlorides already studied, in that the power to combine with water is 

 great, and increases regularly from the most dilute to the most concentrated 

 solution. This is also shown by the curve for this substance in fig. 49. 

 The number of molecules of water combined with one molecule of the salt, 

 increases from the most concentrated to the most dilute solution. We have 

 already met with other substances where this is the case, notably magnesium 

 chloride and bromide. 



*Amer. Chem. Journ., 31, 303 (1904). 



