644 
CHEMISTRY: HARKINS, HALL, AND ROBERTS 
chloride, three uni-bivalent salts. Lanthanum nitrate, a tri-univalent 
salt, was also investigated. 
The general result obtained with the mixtures investigated up to the 
present time is that the lowering of the freezing-point of the mixture is 
80!"""^ j -T , I 1 j ^ 1 1 
40 
2a 
3.00 
4'D 
20 
m 
! 2 5 10 20 50 100 200 500 
FIG. 2 
very nearly that which would be calculated on the basis that each salt 
produces a lowering of the freezing-point proportional to its own con- 
centration and to the mol-number (van't Hoff coefficient i) which it has 
