THE PHYSICAL PROPERTIES OF AQUEOUS SOLUTIONS. 
147 
In the following tables are set out the figures given by Jahn for KC1 and NaCl, 
side by side with the solution volumes calculated from the densities. In Diagram X. 
are set out the values of the E.M.D., both for KC1 and NaCl, as ordinates upon the 
values of SY s as abscissae. The maximum experimental error in the values of the 
E.M.D. is 0-02, so that within the limits of experimental error we have the E.M.D. 
a linear function of SY s . The values of the E.M.D. appear to range a little higher 
for NaCl than for KC1, as was the case when they were set out upon the ionic 
volumes. This may represent a real difference, as there is reason to suppose that 
the density of the water, in combination with the ions and molecules, is slightly 
different in the two cases. In the comparison with ionic volumes we gave two 
different expressions, with constants of slightly different value. In the present 
case we will take one single formula to represent the E.M.D. for both KC1 and 
NaCl, viz., D = l’86 + 3'3 8Y S . 
The calculated values of D are set out in the tables, and the differences fiom the 
observed values given in the last columns. 
Table XXYII.—KC1. 
h~ 213 . 
v s . 
o-03345 \ 
0-3317 
0.03333J 
0-02790 
0-3287 
0-02357 
0-3251 
0-01945 
0-3234 
0-01483 
0-3206 
0-01231 
0-3182 
0-00938 
0-3157 
0-00774 
0-3142 
0-00596 \ 
0-3127 
0-00592J 
3V S . 
D observed. 
ri• 93 1 
0-0249 
{l-94 } 
0-0219 
1-93 
0-0183 
1-91 
0-0166 
1-90 
r i-911 
0-0138 
11'90 J 
0-0114 
1-90 
0-0089 
1-88 
0-0074 
1-89 
f1-87 1 
0-0059 
{ 1‘88 } 
D calculated. 
Difference. 
f - 1 
1-94 
f± 
1-93 
+ 
1-92 
- 1 
1-91 
-1 
1" 90s 
+ 
1-90 
+ 
1-89 
-1 
1-88 
+ 1 
f - 1 
1-88 
{ + 
Table XXYIIL—NaCl. 
Jr 213 . 
v s . 
8V S . 
0-03087 
0-2388 
0-0263 
0-02748 
0-2364 
0-0239 
0-02359 
0-2336 
0-0211 
0-01945 
0-2304 
0-0179 
0-01485 
0-2266 
0-0141 
0-01231 
0-2244 
0-0119 
0-00937 
0-2218 
0-0093 
0-00765 
0-2202 
0-0077 
0-00591 
0-2185 
0-0060 
D observed. 
D calculated. 
Difference. 
1-96 
1-95 
+ 1 
1-95 
1-94 
+ 1 
1-94 
1-93 
+ 1 
1-92 
1-92 
+ 
f 1-901 
I -91 
■f : 1 
11-91J 
l ± 
1-90 
1-90 
+ 
1-88 
1-89 
-1 
1-89 
1-88 
+ 1 
J 1 ' 86 ! 
1-88 
I ; 2 
11'88J 
i ± 
