Patten—Solutions of Hydrochloric Acid in Solvents. 333 
Phosphorus Trichloride as Solvent. —Schuchardt’s phos¬ 
phorus trichloride was distilled over phosphorus pentoxide from 
a dry retort into a dry erlenmeyer eight-ounce flask containing 
the metals. The pure solvent has no action upon any of the 
metals used. See summary in Table I. When dry HC1 gas 
is run in lead is slightly tarnished, tin is very slightly dark¬ 
ened, bismuth is darkened, but beyond this there is no action 
upon any of the metals used. The conductivity of the pure 
solvent and of its HC1 solution is less than that of a dry air gap 
as tested by 110 volts across one millimeter. 
Arsenic Trichloride as Solvent. —Schu chard’s AsC 1 3 was 
treated as in method I. Magnesium is blackened by AsC 1 3 
alone, very likely by a deposit of arsenic. Aluminum, chro¬ 
mium, manganese, zinc, cadmium, tin, copper, silver, gold, 
platinum, palladium are turned black by the solvent alone. 
Iron is corroded red, but the coating is not very thick. A white 
crust, doubtless PbCl 2 , is formed on lead. When the HC1 gas 
was run in, gas was evolved upon magnesium and zinc in about 
equal amount, but only about one-seventh as fast as from zinc 
or aluminum when acted upon by a solution of HC1 in chloro¬ 
form. This is simply my judgment as to the respective rates 
as observed by my eye, and is not to be thought of as a rigid 
quantitative relation. Ho further action was observed upon 
the other metals except bismuth and nickel, which were very 
slightly corroded. Calcite and witherite were not acted upon. 
The arsenic trichloride alone allowed a current of 0.00274 am¬ 
pere to> pass when subjected to 65 volts pressure. The elec¬ 
trodes were about 5 mm. apart and approximately 1 cm. square. 
Antimony Pentchloride as Solvent. —EL de ITaen’s SbCl 5 was 
treated as described in Method 1. The pure solvent acted upon 
iron, coating it red; tin was slightly darkened; bismuth, copper, 
and antimony were blackened; the other metals remained bright. 
When HOI gas was run in, lead was very slightly tarnished; 
silver was blackened; beyond this there was no action upon any 
of the other metals. Those which were bright in the pure sol¬ 
vent remained bright; those which were corroded or deposited 
upon by the solvent alone appeared to undergo no further 
