712 
of the reacting substances in different solvents, beeause the difference 
in heat of solution of eg. A in different solvents is equal to the 
difference of heat of mixing. 
3. Another conclusion to which the supposition made here leads, 
is this: It follows from equation (12) that when A> Ay, also Qur> Q7. 
If we now differentiate (12) with respect to 7, we get: 
Ky 
dln ae 0 Q 
Il ls : = 
Beke me ss on me (L7) 
dT RYT 
from which therefore follows that when A;>Ay the difference 
Inky —ln ky will diminish on increase of temperature, i.e. the difference 
in situation of the equilibria in the two different solvents will 
decrease at higher temperature. 
4. It is almost superfluous to point out bere that when the supposition 
Cy— Cr is not introduced, we obtain through subtraction of equation 
(10) from (9) the equation : 
Ky Qu 
i = — Cr CG ep ln 
n En RT | Tl ( ) 
which likewise gives 
Ky 
dln — 
Se ah 
he RS 
on differentiation with respect to 7, but this equation in itself could 
not convey any special meaning to us. In virtue of (12) it could be 
concluded that when Ay > Ky, also Q77 must be > Qy, and this 
gave rise to the conclusion under 3. 
5. In conclusion it may be pointed out that when it should 
appear that the difference Cy-—Cyy may not be neglected the above 
given consideration will lead us to the knowledge of this difference, 
so that at any rate a study in this direction will lead us to a deeper 
insight in this so important phenomenon. 
Anorg. Chem. Laboratory of the 
University of Amsterdam. 
Amsterdam, 17 October. 
