solubility and polarity 
139 
it is 6.49 ccs. Both of these solvents are strongly polar and their 
structures are very nearly alike. We should therefore, expect the 
solubilities to be about the same, and both should be high. 
TABLE IV 
Solvent 
Soeubill 
OE CO 2 
A 
ry at 20° 
OE N 2 O 
B 
Ratio ^ 
Water 
0-9000 
0.675 
1.335 
Acetone 
6.98 
6.03 
1.155 
Acetic Acid 
5.23 
4.85 
1.078 
Pyridine 
3,85 
3.58 
1.075 
Methyl Alcohol 
3.57 
3.32 
1.07 
Ethyl Alcohol 
2.87 
2.99 
0.96 
Benzaldehyde 
2.98 
3.15 
0.95 
Aniline 
1.38 
1.48 
0.94 
Amyl Acetate 
4.65 
5.14 
0.905 
Ethylene Bromide 
2.27 
2.81 
0.808 
Isoamyl Alcohol 
1.91 
2.47 
0.773 
Chloroform 
3.71 
5.60 
0.664 
In Table IV are listed the solubilities of C0 2 and M 2 0 in twelve 
different solvents as obtained by the writer. In the last column are 
given the ratios of the solubility of C0 2 to that of N 2 0 in any one 
solvent. N 2 0 is considered less polar than C0 2 , and should there- 
fore be found less soluble in polar solvents and more soluble in 
non-polar solvents than C0 2 . Table IV bears out that contention, 
for those solvents which are near the top are generally considered 
polar while those near the bottom of the table are non-polar. This 
means that the ratio of the solubility of C0 2 to that of N s O should 
be greater than one near the top and less than one near the bottom, 
as it is actually found to be. 
While this theory does not pretend to explain the entire problem 
of solubility, it points out a method of approach which it seems has 
not been sufficiently emphasized thus far. 
Physical Laboratory. 
Iowa State College. 
