42 



WORK OF C. M. STINK. 



These values are plotted as curves in figs. 11 and 12. The fact that the curves 

 show positive values of Delias already been explained as possibly due to the increased 

 hydrating power of the molecule over its ions, so that when sufficient driving back in 

 dissociation occurs we would get an increased amount of water eliminated as water of 

 hydration. That this difference is nearly constant is to be expected, since corre- 

 sponding additions of sodium bromide and lithium bromide are always made in 

 changes of concentration. 



200 





a 



100 



- 1 



.5 



s 



* I. 



o 



s 







CO 



>- 



a 



l. 



+.5 







-.5 



Fin. 12. 



Difference between Amount of Water Present 

 as Solvent in Single Solution of Sodium 

 Bromide and in Mixture of Sodium Bromide 

 and Lithium Bromide. 



II. Difference between Values of M for Sodium 

 Bromide in Single Solution and in Mixture 

 of Sodium Bromide and Lithium Bromide. 



Gram Molecules of Salt per Liter of Solution 



CALCIUM NITRATE AND MAGNESIUM NITRATE. 



The values of M for each salt in the mixture and in separate solution are plotted as 

 curves in fig. 13. With increased concentration we have increased divergence in 

 curves I and III, which represent the hydrating power (values of M ) in separate solu- 

 tions of magnesium nitrate and of calcium nitrate, respectively. Consequently, as we 

 should expect, curves II and IV, representing the values of M for the two salts in the 

 mixture, show increasing divergence with increase in concentration. The values 

 given in table 32 are plotted as curves in figs. 14 and 15. 



28 



o 



c 

 IS 



E 



o 

 U 



2 20 



CO 



3 



o 



s 



E 

 2 

 o 



E 



10 



Fig. 13. 



I. Magnesium Nitrate Alone. 

 II. Magnesium Nitrate Mixed with Calcium Nitrate. 



III. Calcium Nitrate Alone. 



IV. Calcium Nitrate Mixed with Magnesium Nitrate. 



.5 1. 1.5 



Gram Molecules of Salt per Liter of Solution 



