fits 
holds for the entropy constants, so that, when we put (Zr, Zr = 
Sr and (Er, But = Qin 
EN Sa 
mr is ve REE 
Ki RT ee 
In 
This formula expresses that the difference in situation of the chemical 
equilibrium in the two different solvents must be ascribed to a differ- 
ence in heat of reaction. 
Now it is at once clear that a difference in thermical effect of 
the same reaction in different solvents is due to the difference in 
heat of mixing of the reacting components in the different solvents. 
If we, namely, consider the simple conversion : 
AZB OQ 
we can think this heat-effect split up into three factors. 
1. the differential heat of unmixing of A = — Qy,,, 
2. the heat of reaction of the conversion of 1 gr. mol. of liquid A 
in 1 gr. mol. of liquid B= Qr, 
and 3 the differential heat of mixing of b= Cup; 
hence 
Q=— Qu, + Art Qu, 
We get, therefore, for the heat effects in the two solvents : 
y= Qu, OR Quy, NOE caro, Wee OLS 
and 
Qr= — Qu, as Qe+ Qu hehe (14) 
so that 
4 Q Er Qu Qu Qu > OM ) * 4 (1 5) 
If we now indicate the difference in heat of mixing of A in the 
two solvents by Qua, ‚j that of B by Qurp, 7, > our equation (12) 
becomes 
8 Qu ‘ —Qu, 
Ay yy BT: (16) 
ln . 
ie ee RT 
i.e. the influence of the solvent on the situation of the chemical equi- 
librium is due to the difference in heat of mixing for the reacting 
components in these different solvents. 
To test this conclusion it will, therefore, be sufficient to deter- 
mine by the side of the constants of equilibrium the heats of solution 
