374 
LitH1uM Hyproxi1pE.—LiOH. 
SOLUTIONS OF CERTAIN HYDROXIDES—MACGREGOR. 
The following table is based on Kohlrausch’s observations 
of the densities of solutions of Lithium hydroxide at a tempera- 
ture of 18° C. 
Vol t 18° 
Percentage of | Dens at Pass “of Solvent Expansion. 
a . H. (grms, per cu. at 18° Water ee (cu. em.) 
in solution. cm.) (cu, em.) eas 
1.25 1.0132 0.9888 0.9869 —0.0019 
2.50 1.0276 0.9763 0.9731 —0.0032 
4.99 1.0546 0.9513 0.9482 —0.003i 
Ctl 1.083 0.9241 0.9233 —0.0008 
Thus for dilute solutions of Lithium hydroxide also the 
expansions are negative. The LiOH curve of Plate I shews 
that the solution exhibiting the greatest contraction is one con- 
taining about 3.6 per cent. of the hydroxide, that the amount 
of its contraction is 0.0036 cu. em., and that the limit of concen- 
tration within which contraction occurs is 8.2 per cent. 
From the same data the following table has been calculated 
giving the expansion on adding Lithium Oxide (Li.O) to water 
. Vol t 18° 
Percentage of | PEMRY | nr ida. ot eelvent | epansion 
: o | ~» (water in] grm. i 
4 Sith shy ase cu. 4 a ee : et es (cu. cm.) 
0.7816 1.01382 0.9869 0.9935 —0.0066 
1.5633 1.0276 0.9731 0.9856 —0.0125 
3.12038 1.0546 0.9482 0.9701 —0.0219 
4.8211 1.083 0.9233 0.9530 —0.0297 
As might be expected the contraction is much greater in the 
case of solutions of the oxide than in that of solutions of the 
hydroxide. The experiments are not sufficient to determine the 
