12 
EFFECT OF VARIOUS SALTS IN MOLECULAR PROPORTIONS. 
In studying the relations of the properties of salts of widely varying 
molecular composition it is imperative that a definite procedure be 
established. With this idea in mind the following curve (fig. 1, p. 10) 
is presented to show the difference in results obtained when the salts 
were added in equal amounts and in molecular proportions to soil 
No. 530. The former rate was 0.5 gram of basic oxid per 100 grams 
of soil and the latter as follows : Calcium carbonate, with a molecular 
weight of approximately 100, was chosen as a standard and added 
at the rate of 0.1 per cent, the other salts in greater or less amounts 
in proportion to their molecular weights. 
From these cm*ves it appears that as a whole the general property 
of a given salt is to affect the soil similarly whether added in equal 
weights or in molecular proportions. This is at least true of the 
capillary activity. The curves throughout are very similar and indi- 
cate that an increase in the concentration of the salt results in a 
diminished capillary activity. 
This variation in activity as affected by increasing the concentra- 
tion of the salt suggested a further study of the phenomenon, the 
results of which are given in Table V. Three types of soil and silica 
sand were used and the amount of salt used varied from none, to 10 
grams per 150 grams of soil. 
Table V.- 
-Capillary 
rise as affected by increase in percentage cf salt added. 
Percentage of salt added. 
Salts. 
Soil No. 530. 
Sou No. 448. 
0.00 
0.06 
0.16 
0.33 
0.66 
3.33 
6.66 
0.00 
0.06 
0.16 
0.33 
0.66 
3.33 
6.66 
Cm. 
Cm. 
Cm. 
Cm. 
Cm. 
Cm. 
Cm. 
Cm. 
Cm. 
Cm. 
Cm. 
Cm. 
Cm. 
Cm. 
CaO 
37.3 
37.3 
34.1 
34.0 
33.2 
33.0 
32.2 
31.4 
33.5 
31.5 
18.7 
28.0 
12.5 
26.2 
30 
30 
35.0 
35.9 
36.5 
37.5 
36.0 
36.0 
37.0 
36.0 
34.0 
34.2 
29.0 
NaNOs 
33.0 
(NH4)2S04.... 
37.3 
31.9 
31.8 
28.6 
25.5 
21.1 
21.4 
30 
37.6 
35.3 
36.0 
34.2 
31.0 
29.8 
CaSoi. 
34.0 
29.8 
29.3 
29.6 
28.5 
29 8 
33.4 
30 
34.2 
34.0 
34.4 
33.2 
34.9 
36.0 
CaH(P04) 
37.3 
35.5 
37.8 
37.2 
38.8 
32.7 
23.3 
30 
34.6 
35.4 
34.9 
37.0 
38.3 
38.8 
CaCOs 
37.3 
35. 4 
33.0 
31.8 
33.8 
35.3 
38.0 
30 
33.3 
32.7 
32.2 
34.1 
35.9 
38.5 
K3PO4 
34.0 
31.0 
29.0 
25.9 
26.0 
21.7 
13.9 
30 
34.9 
33.6 
33.0 
31.4 
31.1 
24.0 
KCl 
34.0 
28.7 
27.8 
29.0 
28.0 
26.5 
26.0 
30 
34.2 
35.0 
34.4 
35.0 
36.3 
34.6 
MgS04 
37.3 
32.5 
30.6 
27.9 
27.2 
21.9 
21.7 
30 
33.1 
38.0 
34.8 
35.8 
31.0 
27.6 
NH4CI 
37.3 
31.8 
30.1 
30.5 
29.2 
26.4 
28.2 
30 
34.2 
34.2 
33.2 
35.8 
34.5 
32.3 
NajCOa 
37.3 
28.4 
24.3 
21.4 
18.7 
9.4 
6.9 
30 
32.6 
33.1 
30.1 
29.5 
17.4 
14.8 
K2SO4 
37.3 
32.3 
31.8 
30.0 
28.2 
26.0 
25.8 
30 
36.4 
36.9 
36.4 
34.8 
31.5 
31.5 
Salts. 
Sou No. 428. 
SUica sand. 
CaO 
29.0 
29.0 
37.0 
38.0 
36.1 
38.0 
38.0 
.37.4 
40.0 
38.0 
33.2 
35.5 
26.2 
34.8 
9 8 
9.8 
7.3 
10.9 
6.4 
12.4 
6.9 
13.7 
7.0 
13.7 
20.0 
12.1 
28.8 
NaNOa 
11.4 
Slbr::::: 
29.0 
37.9 
34.9 
34.6 
35.0 
33.5 
29.4 
9.8 
12.2 
12.6 
12.6 
12.6 
12.3 
12.0 
29.0 
37.0 
38.0 
.35.3 
38.4 
38.8 
41.2 
10.2 
12.1 
16.7 
13.0 
14.5 
22.2 
34.2 
CaH(P04) 
29.0 
38.6 
36.5 
39.0 
40.0 
38.2 
34.1 
10.2 
13.9 
16.8 
15.3 
14.4 
14.5 
18.4 
CaCOa........ 
29.0 
37.7 
38.0 
35.2 
36.3 
38.9 
37.6 
10.2 
16.6 
14.9 
18.3 
20.5 
27.4 
32.6 
K8PO4 
29.0 
38.8 
37.9 
37.0 
36.5 
33.1 
24.2 
10.2 
12.4 
14.6 
16.6 
15.7 
11.6 
12.2 
KCl 
28.0 
36.8 
36.8 
36.6 
36.9 
37.1 
35.2 
9.8 
10.9 
13.5 
11.9 
12.4 
14.1 
16.1 
MgS04 
30.7 
43.2 
42.9 
42.1 
42.8 
40.0 
36.1 
9.8 
13.9 
16.5 
13.8 
13.7 
13.7 
13.7 
NH<C1 
30.7 
41.4 
41.5 
41.2 
40.8 
37.0 
.34.9 
9.8 
11.2 
13.3 
12.3 
11.9 
10.9 
11.4 
N;i2rOj 
30.7 
30.8 
37.7 
36.1 
,39.0 
34.4 
25.4 
9.8 
15.9 
16.4 
14.7 
15.7 
17.5 
17.5 
K2SO4 
29.0 
37.2 
35.7 
34.7 
35.2 
35.2 
35.0 
9.8 
13.7 
14.1 
14.5 
13.9 
13.0 
16.2 
