196 
ME. T. GEAHxlM OX LIQUID DIFFUSIOX APPLIED TO AXALTSIS. 
union with the same acid, or rather both were in the state of chloride. But the metals 
might be used in combination with different acids, and these acids themselves might be 
of equal or of unequal diffnsibility. If of equal diffusibility. such as nitric and hydro- 
chloric acids, no reason appears why the acids should affect the amount of separation. 
But if the acids are unlike in diffusibility, the case is not so clear. If, for instance, the 
potassium were in the form of chloride and the sodium of that of sulphate, might not 
the diffusion of the potassium be promoted by the highly diffusive chlorine with which 
it is associated, and the diffusion of the soda, on the other hand, be retarded by its asso- 
ciation with the slowly diffusive sulphuric acidl Will, in fine, the separation of the 
metals be greater from a mixture of chloride of potassium and sulphate of soda, or even 
from sulphate of potash and chloride of sodium, than from the two chlorides, or from 
the two sulphates'? The inquiry, it will be remarked, raises the whole question of the 
distribution of acid and base in solutions of mixed salts. It will be illustrated by a 
comparison of the diffusion of chloride of potassium mixed with sulphate of soda, with 
the diffusion of sulphate of potash mixed Avith the chloride of sodium, the salts being 
taken in equivalent proportions. 
Table IX. — Diffusion of a mixture of 5T2 per cent, of Chloride of Potassium and 4-88 
per cent, of Sulphate of Soda (equivalent proportions), for seven days, at 14°. 
Nuanbor of 
stratum. 
Potassium, 
in grammes. 
Sulpliuric acid, 
in grammes. 
Total diffusate, 
in grammes. 
1 
•023 
•002 
•024 
o 
•035 
•002 
•030 
3 - 
•048 
•004 
•045 
4 
•064 
•009 
•066 
5 
•092 
•016 
•097 
6 
•128 
•032 
•149 
7 
•174 
•058 
•215 
8 
•242 
•105 
•316 
9 

•441 
10 
•615 
11 
•815 
12 
1-042 
13 
1-290 
14 
1-517 
15 and 16 
3-346 
1 
1 
j 
10-008 
