on solutions of the Metals. 335 
Min of Precipitated Tellurium on the solutions of Copper, Silver 
and Lead 
Without the aid of reducing ‘ijt —Precipitated tellurium, left 
r Pas days in solutions of sulphate and acetate of copper, did not unite 
any copper. Boiled with sulphate of copper, four or wih hours, it 
remained unchanged. Boiled with acetate of copper, it took up 
uct of this action, peti ed by 
ak the tellurium: four or five hours with the acetate, co consisted of a 
_— wlred in bata regia and the oxyd of Silppat precipitated by pa Soke 
} = ash, dried, and ignited with nitre and carbonate of potash. To free the 
j oxyd entirely from tellurous acid, it was again boiled with caustic potash, 
found yng: the — of copper was tested for tellurium and was still 
d to co a trac 
02671 g aie imiaw gave 00831 oxyd of copper. 
culated. Found. 
2Cu, 63°4 24-82 24°82 
3Te, 192 75°18 
255-4 55°4 100°00 
This sand the following are, I ani the only analyses that have been 
of a tellurid of copper. Gmelin (Handbook of Chem. Engl. Transl.) 
y Mentions that tellurid of copper is pale red, according to Berzelius. 
Avatg of tellurium upon nitrate of silver has been observed 3 
that it acts very freely upon the solution of nitrate o 
M3 ver, and pion a black powder, which ie not assume the metallic fate 
Under pressure. Fischer does not mention whether the black powder 
Was tellurid of silver or metallic silver, tat jie it to be inferred that it 
Was the latter, as the observation is given in connection with the reducing 
action of the metals upon the salts of silver. That tellurid of silver is 
ed is probable from the praca’ rere of sulphur upon nitrate of 
Ailver, as well as of selenium and tellurium on acetate of copper. Th 
owing experiment also makes he probable. Precipitated tellurium 
And tellurium, both in Jar arge quantity. Now, if metallic silver was pre- 
rpitated by the tellurium, probably little or no tellurium would —. 
noxydized, after being in contact so long with an ex cess of the si 
lation, but would either pass entirely into solution (the i abate of te 
Hous acid dissolves in water with tolerable facility—Berzelius), eat 
Was not song liquid present to d dissolve the whole, be visib! 
Mhite tellurous ac 
i ‘ie no = tllarum, boiled a long time with acetate of lead, precipi- 
| 2 Win t reducing ts—Precipitated tellurium, heated 
a vith reel clipe is wo acid, aoe with considerable 
“per. For analysis of the poe of this reaction, a portion was pre- 
