24 



WORK OF C. M. STINE. 



Table 11 Continued. 



In table 12, m c = normal concentration of each salt in the mixture, a = dissocia- 

 tion of each salt in the mixture, as given in table 11. mL = lowering of freezing 

 point, calculated from formula [(1.86X2a) + 1.86]w. The correction percentage is 

 deduced on the assumption that the two salts form the same hydrates in the mixture 

 that they form in separate solutions. Upon this assumption the amount of water 

 which each salt would eliminate from the sphere of action as solvent is calculated 

 from the formula 



1000 - Nr X lOOol 



The values for magnesium chloride and calcium chloride are added together, and to 

 this is added also the difference between 1,000 grams and the amount of water actu- 

 ally present in one liter as given by the weight-normal corrections. This, then, is 

 given as a percentage correction in the column headed "Correction, per cent." 

 The value mL is divided by this percentage and the result given under A. 



Evidently the sum of the values of A for calcium chloride and magnesium chloride, 

 as thus found, should equal the lowering found experimentally for the mixture in 

 question. These values are placed side by side, for comparison, in table 12. 



Table 12. Conditions in the Mixture of Calcium Chloride and Magnesium Chloride. 



m 



m c 



a 



mL 



Correction, 

 per cent. 



0.3 CaCl 2 

 0.3 MgCl 2 

 0.5 CaCl 2 

 0.5 MgCl 2 

 0.7 CaCl 2 

 0.7 MgCl 2 

 0.9 CaCl 2 ' 

 0.9 MgCl 2 

 1.3 CaCl 2 ' 

 1.3MgCh, 

 1.7 CaCl 2 

 1.7 MgCl 2 

 2.1 CaCl 2 ' 

 2.1 MgCl 2 



0.15 

 0.25 

 0.35 

 0.45 

 0.65 

 0.85 

 1.05 



f0.636 

 10.664 

 f0.589 

 10.605 

 f0.558 

 10.549 



ro . 510 



10.538 

 f0.454 

 10.460 

 r 0.406 

 10.396 

 "0.357 

 [0.336 



0.6341 

 0.6501 

 1.0121 

 1.0271 

 1.3781 

 1.3661 

 1.6901 

 1.7381 

 2.360) 

 2.321, 

 2.8651 

 2.8321 

 3.3461 

 3.264] 



78.9 

 68.0 

 58.8 

 51.2 

 38.5 

 25.8 

 14.7 



.") 



6 



1 



111 



0.803^ 

 0.823] 

 1.4881 

 1.5101 

 2.3451 

 2.3251 

 3.2981 

 3.3921 



9981 



035! 



13 



00 



(22.85 

 122.29 





