34 IONIZATION COEFFICIENTS OF CERTAIN 
addition, in order to determine how closely the depression in the 
case of simple solutions can be calculated by means of ionization 
coefficients determined by conductivity measurements, I observed 
the depression in the case of simple solutions also. 
The work involved in’ making the desired test therefore 
included the following:—(1) The purification or testing of 
the materials; (2) the preparation and analysis of series of 
simple solutions and the preparation of the mixtures ;..(3) the 
measurement of the conductivity of series of simple solutions 
at 0° C.; (4) the determination of the equivalent conductivity 
at 0° C. of the two electrolytes at infinite dilution; (5) the 
calculation of the ionization coefficients of the simple solutions ; 
(6) the measurement of the depression of the freezing-point for 
the simple solutions; (7) the calculation of the depression for. 
the simple solutions by means of the ionization coefficients. 
obtained from the conductivity measurements ; (8) the measure- 
ment of the depression of the freezing-point in the case of the 
mixiures; (9) the determination of the ionization coefficients of 
the electrolytes in the mixtures, and (10) the calculation of the 
depression of the freezing-point of the mixtures by means of 
these coefficients. 
The Materials, 
The salts were obtained as chemically pure from Eimer and) 
Amend of New York, and were re-crystallized carefully three. 
times, after which treatment no appreciable impurities could be. 
detected. 
he water used was purified by Hulett’s* method, except 
that a block tin condenser was employed instead of a platinum 
one. Portions of the distillate were treated in the same manner 
as to exposure to air, ete, as a solution would be, and their 
conductivity measured. It was found to vary from 0.88 x 107?°® 
to 0.96 x 10-19, expressed in terms of the conductivity of mer- 
cury at 0°C. It was kept in bottles which had been used for 
this purpose for several years. 
" Journ. Phys. Chem. 1, 91, (1896). 
