48 ROYAL SOCIETY OF CANADA 
OBSERVATIONS ON THE FREEZING-POINT DEPRESSIONS. 
Table IV contains the values of the depression of the freezing-point 
of the simple solutions, these values being the observed values with the 
correction for concentration introduced according to equation (4). It 
also contains the values of the molecular depression, £.e., the lowering 
produced by each gramme-molecule or gramme-ion of the electrolyte in 
the solution, calculated by expression (1) with the data given in this 
Table and in Table III. In the case of HCl, there being only one 
possible way for the molecules to dissociate, namely into two ions, H and 
Ol, the m in the expression (1) equals 2; but with #,SO,, since the 
mode of ionization is doubtful, I have made the calculations on the 
assumption that the molecules dissociate into H, H, and SO, when m 
therefore equals 3, and also on the assumption that the dissociation is into 
Hand HSO,, when m equals 2. The concentrations are expressed as in 
former tables, and the depressions in centigrade degrees. 
TABLE IV. 
| 


Molecular Depression. 
Depression of 









Concentration: Freezing-Point. 
NZ) m = 3 
| 
H CL (36°46) 
0207 0752 1°838 
0518 “1859 | 1°836 
0829 2954 | 1°836 
104 "3692 1°837 
207 * 7408 1°875 
305 1°1064 | 1°912 
H»SO, (98°08) 
‘0203 ‘0902 2°583 1°821 
0508 2114 2°531 1°818 
‘0811 3266 2:503 1°816 
*102 4032 2°477 1°812 
203 ‘7864 2°469 1°812 
“304 1°1644 2°466 1°818 



