TRANSACTIONS 
OF THE 
Aova Scotian Knstitute of Science. 
SESSION OF 1895-96. 
I—-ON THE CALCULATION OF THE CONDUCTIVITY OF MIXTURES 
OF ELECTROLYTES.— By Pror. J. G. MacGReEeGor, 
Dalhousie College, Halifax, N. S. 
(Read 9th December, 1895.) 
Arrhenius has deduced* as one of the consequences of the 
dissociation theory of electrolytic conduction, that the condition 
which must be fulfilled in order that two solutions of single 
electrolytes, which have one ion in common, and which undergo 
no change of volume on being mixed, may be -isohydriec, 7. e., 
may on being mixed undergo no change in their state of disso- 
ciation, is, that the concentration of ions (%. e., the number of 
dissociated molecules per unit of volume) shall be the same for 
both. He obtained this result by combining the equations of 
kinetic equilibrium for the constituent electrolytes before and 
after mixture. As I shall have occasion to refer to these 
equations below, I may give them here. 
Let P,, Q and P, BR be the general chemical formule for two 
electrolytes having the ion P in common; let v, and v, be the 
*Ztschr. f. physikalisehe Chemie, ii, p. 284, (1888.) 
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