II].—On a TEST, BY THE FREEZING-POINT METHOD, OF THE 
IONIZATION COEFFICIENTS DETERMINED BY THE CONDUC- 
tivity Meraop, FoR SoLuTIONS CONTAINING POTASSIUM 
AND Sopium SULPHATES.—By E. H. ARCHIBALD, M. Sc., 
1851 Exhibition Science Scholar, Dalhousie College, 
Halifax, N.S. 
(Communicated by Prof. J. G. MacGregor; Received September 15th, 1898.) 
The experiments described below were undertaken, at e 
suggestion of Prof. J. G. MacGregor, for the purpose of testing 
the values of the ionization coefficients obtained by means of his 
graphical method,* in the case of a mixture of solutions of two 
electrolytes with a common ion, by employing them in the caleu- 
lation of the depression of the freezing-point, and comparing the 
calculated values with values obtained by experiment. 
The time at my disposal was very limited, and in consequence 
I was able to make the test only in the case of equimolecular 
solutions of two electrolytes. Potassium and sodium sulphates 
were selected as the electrolytes, not because of their being the 
most suitable for the purpose, but because I had been observing 
their conductivity and had already obtained some of the requisite 
data. 
As, in determining the depression of the freezing-point, the 
solutions must be at a temperature of about 0° C., it was neces- 
sary that the ionization coefficients should be determined for 
approximately the same temperature. Both the specific con- 
ductivities of simple solutions of the two electrolytes throughout 
the range of concentration of the simple solutions used in 
preparing the mixtures, and their equivalent conductivities at 
infinite dilution, had therefore to be determined for 0° C., as well 
as the depression of the freezing-point for the mixtures. In 
*Trans. N.S. Inst. Sci., 9, 101, (1895-6). 
Proc. & TRANS. N. Sh JESBINE leigs Woe OG TRANS.—C. 
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