128 
MR. W. R. BOUSFIELD: IONIC SIZE IN RELATION TO 
Table XVI.—Ionic and Solution Volumes for NaCl. 
p. 
I„. 
V, (from density). 
V g calculated. Difference. 
6 
10-31 
0-307 
0-307 ± 
4 
11-34 
0-299 
0-299 ± 
3 
11-95 
0-294 
0-294 ± 
2 
12-72 
0-289 
0-288 ! +1 
1 
13-72 
0-279 
0-280 -1 
0 
15-68 
— 
0-265 — 
( b ) Density a Function of Radions .—As in the former paper, we may now proceed 
to deduce a rational density formula for KOI and NaCl from the expressions for the 
solution volumes. 
The densities are given by the expression 
1 
P 
1 _ 
Po 
p 
100 
As V s has been expressed in each case as a function of the radions, we now have 
the densities expressed simply as a function of the radions. The agreement between 
observed values and values calculated from the radions is shown in the following 
tables:— 
Table XVII.—Density of KC1, calculated from Radions. 
P. 
P observed 
P calculated. 
1 
Difference. 
6 
1-03745 
1-03747 
-2 
4 
1-02437 
1-02439 
-2 
3 
1-01749 
1-01792 
+ 2 
2 
1-01148 
1-01148 
+ 
1 
1-00507 
1-00507 
+ 
Table XVIII.—Density of NaCl, calculated from Radions. 
P. 
p observed. 
p calculated. 
Difference. 
6 
1-04201 
1-04199 
+ 2 • 
4 
1-02750 
1-02748 
+ 2 
3 
1-02027 
1-02026 
+ 2 
2 
1-01308 
1-01309 
- 1 
1 
1-00592 
1-00591 
+ 1 
In both cases the formulae hold with great accuracy. 
