TRANSACTIONS 



OK THE 



Scotian Jnstitute of .Science. 



SESSION OF 1901-1902. 



I ON A DETERMINATION OF THE FREEZING-POINT DEPRESSION 

 CONSTANT FOR ELECTROLYTES. BY THOS. C. HEBB, 

 M. A., Dalkousie College, Halifax, N. S. 



(Communicated on 10th February, 190S, by Prof. J. O. MacGreyor.) 



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 0C. 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 paperf pub- 

 lished by the Nova Scotian Institute of Science, he described a 

 second method, and applied it to all the available data for 

 electrolj'tes, 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 a) + fa where <f is the 



* Trans. Roy. Soc. Can. (2), Vol. 6, Sec. 3, 3, 1900-01. 

 t Proc. & Trans. N. S. Inst. Sci., Vol. x. p. 211. 1899-00. 



PROC. & TRANS. N. S. INST. Sci., VOL. X. TRANS. CC. 



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