606 WILLIAM LAWTON GOODWIN ON THE 
the solubility of a gas in water, and this solubility as usual decreases with rise 
of temperature. 
Potassium Chloride.—A solution of pure potassium chloride was made, so as 
to contain 20 gms. salt in 100 ¢.c. solution. The chloride was recrystallised to 
insure its purity, and the absence of bromine, iodine, and oxidising agents was 
proved. When the solution was exposed to a current of chlorine at low 
temperatures, chlorine hydrate did not appear until the thermometer marked 
2°. As the solution had been saturated at the ordinary temperature before 
cooling, it is evident that the presence of potassium chloride prevents the 
formation of solid chlorine hydrate between 2° and 10°. The maximum 
solubility is at 9°, the hydrate beginning to decompose rapidly between 7° and 
8°, and disappearing completely at 9°. Potassium chloride in solution then 
hastens the decomposition of chlorine hydrate, and decreases the solubility of 
the gas in water. It will be noticed that the ascending part of the curve is 
almost identical with the prolongation of the corresponding part of the curve 
for water. In other words, chlorine hydrate has the same solubility in this 
solution of potassium chloride as in pure water until a temperature of 7° is 
reached. The descent from the maximum is at first rapid, and then more 
gradual. 
KCl. 
: p Na,$,0, a 
— 30 741-0 116 1-0812 
— 07 14:1 13142 
Beales 7 1-6497 
2-2 19-1 1:7802 
55 22'8 21251 
8-0 23°3 21717 
LVI 735°5 12-9 12114 
+ 0:0 141 1:3243 
3-0 19-9 18687 
4-0 20-1 18875 
5-2 21-6 2-0283 
75 22-7 21316 
105 23-5 22067 
18-0 143 13428 
24-0 10°5 0:9860 
31:8 9°5 08921 
35:0 8°7 0:8170 
1 c.c. Na,S,O,=0-010337 gm. iodine. 
Sodium Chloride.—A solution was made containing 15°71 gms. in every 100 
c.c., ae. molecule for molecule with the solution of potassium chloride. 
