TeANSAVE LrONS 
OF THE 
Aova Scotian Institute of Science. 
SESSION OF 1901-1902. 
]—On A DETERMINATION OF THE FREEZING-POINT DEPRESSION 
CONSTANT FOR ELECTROLYTES.—By THos. C. HEbB, 
M. A., Dalhousie College, Halifax, N. 8. 
(Communicated on 10th February, 1902, by Prof. J. G. MacGregor.) 
In a paper read before the Royal Society of Canada,* Dr. 
MacGregor has described a method of combining the observa- 
tions of different observers on the freezing-point. depressions of 
electrolytes, for which the ionization coefficients at O°C. are 
known, for the purpose of determining the depression constant 
for electrolytes. He also applied the method to a few sets of 
observations made in the Dalhousie College Laboratory, and 
found that the value so obtained agreed very closely with what 
one would expect from theory. In a subsequent paper+ pub- 
lished by the Nova Scotian Institute of Science, he described a 
second method, and applied it to all the available data for 
electrolytes, in which both determinations of the freezing-point 
depressions, and of the ionization coefficients had been made. 
At his suggestion, I have applied the first method to the experi- 
mental material contained in the second paper, and to a few 
observations of my own as well, with the result given below. 
The method is based upon the assumption, verified by 
experience, that the formula: 6=k (1—c)+la—where 4 is the 
* Trans. Roy. €oc. Can. (2), Vol. 6, Sec. 3, 3, 1900-01. 
+ Proc. & Trans. N.S. Inst. Sci., Vol. x, p. 211, 1899-00. 
Proc. & TRANS. N.S. INST. Scr., VOL. X. TRANS. CC. 
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