the Attractive Powers of Mineral Acids. 2 s 
ioiution a moderate heat is requifite. This folutioa affords 30 
cubic inches of vitriolic air. Standard filver affords more air 
and requires more acid for its folution. The calces of filver 
(that is, filver precipitated from its folution in nitrous acid by 
fixed alkalies, and well-wafhed, but which ff ill retains fome ni- 
trous acid), are foluble even in dilute vitriolic acid, without the 
abidance of heat. 100 grs. of vitriol of filver, formed by pre- 
cipitation, contain 74 grs. of filver, about 17 of real acid, and 
9 of water. 
Silver in the nitrous acid. 
100 grs. of the pured filver require for their folution 36 of 
mere nitrous acid, diluted with water in the proportion of one 
part real acid to 6 of wliter, applying heat only when the folu- 
tion is almod faturate. If fpirit of nitre be much more or 
much lefs dilute, it will not ad wfithout the abidance of heat. 
The lad portions of filver, thus taken up, afford no air. Stan- 
dard filver requires about 38 grs. of real acid to diffolve the fame 
proportion of it. And the folution of it affords 20 cubic inches 
of nitrous air, whereas 100 grs. of filver, revived from luna 
cornua , afford about 1 4. 
Silver in the marine acid. 
I have not been able'to diffolve filver, in its metallic date, in 
fpirit of fait, yet I believe it may be effeded, if fufficient time 
be allowed, as Mr. bayen, in his Treatile on Tin, p. 201. 
fays, he diflblved 3! grs. of filver by digeding it for fome days 
in two ounces of drong fpirit of fait. Leaf filver is alfo faid to be 
corroded by drong fpirit of fait, 1 newm. 70. The dephlogidd 
cated marine acid alfo diflblves it, according to the obfervations 
of Meffi scheele and bergman : and fo does the phlogidi- 
cated 
