CHEMISTRY: HARKINS, HALL, AND ROBERTS 
645 
when present alone in a solution of the same total salt concentration. In 
the 1 : 1 mixtures the freezing-point curve for the mixture lies midway 
between the curves for the two salts taken separately. However, it would 
not be surprising if later results on other salts should show somewhat 
different relations; for the salts thus far used have been chosen because 
on the whole they act normally in other respects. 
— 
y 
© Co 
Cl2 
• K2SO4 
\ 
60 
40 
20 
SjOO 
SO 
60 
40 
20 
400 
10 
20 56 
FIG. 3 
100 
200 
SCO 
The results obtained on a mixture of 1 mol of mannite and 2 mols of 
potassium chloride are given in the following table, which shows how 
closely the effect is additive. The ^deviation' given in the last column 
shows how much the sum of the freezing-point-lowerings caused by the 
separate components exceeds that observed for the mixture. 
