SOLUTIONS OF CERTAIN HYDROXIDES—MACGREGOR, Byal 
According to Thomsen. 
Percentage of 
Na2O in 
solution. 
0.8528 
1.6871 
3.3023 
5.38519 
10.0126 
17.7346 
Density at 
18°C, 
(grms. per cu. 
cm.) 
1.0111 
1.0232 
1.0472 
1.0768 
1.1435 
1.2559 
Volume of 1 
Percentage of 
Na;O in 
solution. 
3.7754 
8.3726 
15.2413 
23.0015 
33.1184 
Density at 
18°C. 
(grms. per cu. 
cm.) 
1.0552 
1.1222 
1.2224 
1.3337 
Volume at 18°C, 
of solvent 
grim. of solu water in grm,| Pxzencion 
RnR CME SSI (cud cat)y 
0.9891 0.9928 —0.0037 
0.9773 0.9844 —0.0071 
0.9549 0.9683 —0,.0134 
0.9287 0.9477 —0.0190 
0.8745 0.9011 —0.0266 
0.7962 0.8237 —0.0275 
According to Kohlrausch. 
Volume at 18°C. 
Vol fl 
person sole: ut Be vent Expansion. 
tion at 18° C, Moet Serine (cu. cm.) 
(cu. cm.) (cu. cm.) 
0.9477 0.9631 —0.0154 
0.8911 0.9170 —0.0259 
0.8181 0.8483 —0.0302 
0.7498 0.7706 —0.0208 
0.6694 + 0.0116 
1.4685 
0.6810 
As might be expected, the values of the expansion are (alge- 
braically) much smaller than in the case of the solution of the 
hydroxide. 
The results of the last table are shown graphically in 
' Plate I. The curve shows that the maximum contraction in this 
case is 0.0306 cu. cm., and is exhibited by a solution containing 
about 14 per cent. of the oxide, and that the expansion is negative 
for all solutions containing less than 29.6 per cent. 
