THE PHYSICAL PROPERTIES OF AQUEOUS SOLUTIONS. 
127 
where p is the density of the solution at 18° C. and p 0 the density of water. The 
KC1 densities used are given in the former paper. The NaCl densities used are those 
tabulated in Table I. 
In diagrams IV. and V. the solution volumes are plotted as ordinates upon the 
ionic volumes as abscissae. They give the following linear relations, from which the 
calculated values of V s given in the tables are derived* :— 
For KOI.V s = 0-408-0-00751,, 
for NaCl.V s = 0-390-0-00801,, 
Table XV.—Ionic and Solution Volumes for KC1. 
p. 
b. 
V s (from density). 
V s calculated. 
Difference. 
6 
4-144 
0-377 
0-377 
+ 
4 
4-716 
0-373 
0-373 
+ 
3 
5-075 
0-369 
0-370 
- 1 
2 
5-514 
0-367 
0-367 
+ 
1 
6-096 
0-363 
0-362 
+ 1 
0 
7-261 
— 
0-354 
* In the former paper the hydration numbers Bi and B 2 for K and Cl were taken as equal. The 
revised figures for KC1 are therefore here given. 
