WORK OF C. M. STINE. 



21 



molecule or ion of calcium chloride will combine will be diminished; that is, the value 

 of M will be diminished. 



In order to compare the difference between the amount of water present acting 

 as solvent towards the calcium chloride in the single solution and in the mixture, 

 with the difference in the values of M in the two cases, we give in table 8, under 

 Dh*o, the difference between the number of grams of water present as solvent in 

 the separate solution of calcium chloride and in the mixture at the respective con- 

 centrations ; under D m , the difference in the values of M for the separate solution 

 of the calcium chloride and in the mixture at the same concentrations. 



Table 8. 



These results are plotted in curves as fig. 2. For the first four concentrations 

 the values of M decrease by the same amount, since the amount of potassium 

 chloride added is increased as the calcium chloride is increased. Consequently 



ii 



Fig. 2. 



'een Amoi 



in the Single Solution of Calcium Chloride 

 and Potassium Chloride. 



Difference between Values of M for Calcium 

 Chloride in Single Solution of Calcium 

 Chloride and in Mixture of Calcium Chloride 

 and Potassium Chloride. 



a 



0) 



e 

 1 



o 



40 



30 



20 



10 



r 



.5 



1. 1.5 



Gram Molecules of Salt per Liter of Solution 





9) 



3 



8 I 



o 



the curve for the difference in the values of M is approximately parallel to the axis 

 of abscissa (concentration). Referring to table 7, it will be seen that the difference 

 between successive values of M diminishes with increase in concentration, until 

 finally, in the mixture containing 2.7 N calcium chloride and 2.59 N potassium 

 chloride, M has the value 20.9. The effect of the potassium chloride on the amount 

 of water with which the calcium chloride can combine is such that, although the 



