40 
PROFESSOR GRAHAM ON THE DIFFUSION OF LIQUIDS. 
III. DIFFUSION OF SALTS OF SODA. 
(1.) The only salts of soda which I have yet had an opportunity of diffusing in a 
sufficient variety of circumstances are the carbonate and sulphate. These salts 
appear to be equi-diffusive, but to diverge notwithstanding more widely in the solu- 
tions of the higher proportions of salt than the corresponding potash salts. It is a 
question whether this increased divergence is not due to the less solubility of the 
soda salts, and the nearer approach consequently to their points of saturation in the 
stronger solutions. 
Table XIII. — Diffusion of Carbonate and Sulphate of Soda. 
Parts of anhydrous salt 
to 100 water. 
Density of 
solution at 60°. 
At 64°. 
At 37°-7. 
Experiments. 
Mean. 
Experiments. 
Mean. 
Carbonate of soda. 
2 
1*0202 
4*15 
2*78 
4*08 
2*62 
4*21 
4*14 
2*73 
2*71 
4 
1*0405 
7-96 
5*31 
7-70 
4*94 
7*68 
7*78 
5*35 
5*20 
1*0653 
12*16 
8*50 
12*06 
8*45 
12*45 
12*22 
8*05 
8*33 
10 
1*0957 
17*13 
16*53 
17*00 
16*88 
Sulphate of soda. 
2*96 
2 
1*0179 
4*35 
4*32 
3*03 
4*25 
4*31 
3*09 
3*03 
4 
1*0352 
8*14 
5*63 
8*10 
5*64 
8*28 
8*17 
5*42 
5*56 
6f 
1*0578 
13*26 
8*77 
13*63 
8*84 
8*80 
13*61 
13*50 
10 
1*0847 
18*71 
19*73 
18*91 
19-14 
The range of the thermometer during the continuance of the experiments at the 
higher temperature was from 64°*5 up to 65° and falling again to 63°; the mean of 
all the days being 64°. The temperature of the other series, or of the ice-box, was 
42° the first day, 38° the second, and 37° steadily for the remainder of the period ; 
the mean being 37°'7- 
The mean results at 64° are as follows : — 
2. 
4. 
6^ 
yjQ. 
10. 
Carbonate of soda 
4*14 
7*78 
12*22 
16*88 
Sulphate of soda 
4*31 
8*17 
13*50 
19*14 
