Patten—Solutions of Hydrochloric Acid in Solvents. 327 
Carton Tetrachloride as Solvent. —Schuchardt’s c. p. car- 
bontetrachloride was dried over fused calcium chloride 
for three days. It boiled at 75°.0 O. under 741.7 mm., 
and was sealed up in a glass tube as described under 
“Method 1.” The solvent itself is without action upon the 
metals used. As soon as the hydrogen chloride gas was run in 
an active evolution of gas upon the zinc was noticed. Magne¬ 
sium was not acted upon, remaining perfectly bright for two 
hours, when a black deposit appeared upon it. Aluminum was 
attacked less: vigorously than the zinc, but maintained a steadier 
evolution of gas. The evolution of gas upon zinc gradually de¬ 
creased, a white coating forming upon the metal. At first tin 
was merely corroded but after about twenty minutes gas was 
given off upon it and finally a brisk evolution set in which 
proved to be steadier than that upon the zinc. Lead was cor¬ 
roded, a white crust, doubtless PbCl 2 forming upon it. Iron 
was: attacked with the formation of a red crust—E'eCl 3 . Cad¬ 
mium was very slightly attacked, some minute bubbles rising 
from it at long intervals. Hickel, copper, silver, antimony, 
bismuth, manganese, chromium, arsenic, tellurium, platinum, 
palladium, gold, and calcite and witherito were not acted upon; 
no gas was evolved, and their lustre remained undimmed. The 
conductivity of this solution, after being siphoned off through 
the air was; less than that of a dry air-gap. Contact of one 
metal with another made no difference in any of the above re¬ 
actions. 
Experiment 2. A sample of the same carbon tetrachloride 
was left drying for two weeks over fused calcium chloride and 
then distilled from fresh calcium chloride in a dried apparatus 
(as given in method 2), and dry hydrogen chloride run in. 
The metals magnesium, zinc cadmium and aluminum were 
used. Zinc is immediately attacked and evolves gas with con¬ 
siderable rapidity, but after an hour a protective coating begins 
to form on the zinc, ZnCl 2 in all probability. After twenty- 
four hours the metals, except zinc, are still unacted upon, while 
the zinc is completely coated over with a white crust. The so- 
