PRECIPITATION OF METALS. 
217 
liquid became troubled. The same solution, with 15 per 
cent, of hydrochloric acid, was immediately precipitated. 
A solution of protochloride of tin, T ^, acidified with 40 
per cent, of hydrochloric acid was not precipitated by sulphu- 
retted hydrogen. But when the solution, saturated with the 
gas, was thrown into water, a precipitate of sulphuret of tin 
was immediately formed. A solution of tin, mixed with 
50 per cent, of acid is precipitated by sulphuretted hydrogen. 
A solution of acts exactly like that of T i F . 
A solution of perchloride of platinum, T J^, mixed with 25 
per cent, of hydrochloric acid is not precipitated by sulphu- 
retted hydrogen. 
A solution of chloride of gold, -j.oVtp mixed with 50 per 
cent, of hydrochloric acid, is scarcely troubled by sulphuretted 
hydrogen. A solution of T o.Voo m i xe d with 50 per cent, of 
acid, does not exhibit any reaction. 
A solution of potassa and tartrate of antimony of T ^^ 9 
mixed with 50 per cent, of acid, is slightly disturbed by sul- 
phuretted hydrogen. A solution of — 1 — is still colored yel- 
r . 150 00 \ 
low: and finally asolutionof — 1 — does not exhibitany reaction. 
J < 3 0.0 J 
Acetate of copper, in a solution of L_ , mixed with 25 
. . . 10.000 
per cent, of hydrochloric acid, is precipitated in a very de- 
cided manner. In a solution of — I — with 50 per cent, of 
1 5-0 1 
acid, it is even yet slightly troubled ; but a solution of 
4o * - - with 50 per cent, of acid, does not present any ap- 
pearances of reaction. 
One part of fused nitrate of silver was dissolved in 15.000 
parts of water; hydrochloric acid was added, and immediately 
a precipitate was formed, which redissolved in the excess of 
acid. This solution, containing 50 per cent, of acid, gave, 
with sulphuretted hydrogen, a very notable gray precipitate. 
A solution of — I — was even yet precipitated in a sensi- 
25.00 0_ J 11 
ble manner. A solution of — I — was still slightly troubled. 
3 0.0 Z> J 
Finally, in a solution of 1 . no effects were produced. 
J 60.000 < 1 
One part of arsenious acid, dissolved in 20.000 parts of 
water, was acidified by 50 per cent, of hydrochloric acid. 
This solution, submitted to sulphuretted hydrogen, gave a 
vol. r. — no. ill. 28 
