30 
PROFESSOR GRAHAM ON THE DIFFUSION OF LIQUIDS. 
increases with the large proportions of salt in solution. They are both considerably 
more diffusible than the seven preceding salts, 
(5.) A second pair of isomorphous salts were compared, the chlorides of potassium 
and ammonium. 
Table XL — Diffusion of Chloride of Potassium and Chloride of Ammonium. 
Parts of anhydrous salt 
to 100 water. 
Density of 
solution at 60°. 
At 66 
°-2. 
At 64 
°-7. 
Experiments. 
Mean. 
Experiments. 
Mean. 
Chloride of potassium. 
2 
1-0127 
7-83 
8-03 
7-72 
7-89 
7-96 
7-55 
7-70 
4 
1-0248 
13-22 
15-21 
15-59 
14-82 
15-01 
15-07 
15-29 
6f 
1-0401 
24-88 
24-83 
24-64 
24-62 
24-72 
25-09 
24-87 
10 
1-0592 
36-23 
37-63 
36-93 
Chloride of ammonium. 
2 
1-0061 
7-10 
7-10 
8-52 
7-81 
7-24 
7-17 
4 
1-0118 
14-35 
13-91 
14-64 
14-60 
14-91 
14-41 
1-0190 
24-30 
24-30 
24-12 
24-13 
24-12 
10 
1-0272 
36-53 
36-33 
These two salts agree well in diffusibility, and are also evidently related to the 
preceding nitrates. The quantity of chloride of ammonium diffused was determined 
by evaporation, whicli is troublesome and may lead to small errors, from the vola- 
tility and efflorescent tendency of this salt. It would be easier and more accurate to 
determine this and other chlorides by the use of a normal solution of nitrate of silver, 
and so avoid evaporation. 
Diffusion at 66°"2. 
2. 
4. 
6|. 
10. 
Chloride of potassium 
7-70 
15-29 
24-87 
36-93 
Chloride of ammonium 
7-81 
14-60 
24-30 
36-53 
The quantities diffused of these two chlorides are more closely in proportion to 
the strength of the original solution, than with any of the preceding salts of potash. 
Thus the quantities diffused from the 2 and 10 per cent, solutions of chloride of 
potassium are 7'70 and 36’93 grs., which are as 2 to 9‘6, which is nearly fis 2 to 10. 
Chloride of sodium was observed before to be nearly uniform in this respect; but 
other salts appear to lose considerably in diffusibility with the higher proportions of 
