SILVER. 
precipitated in the state of a white powder when phos 
phorie acid is poured into liquid nitrat of silver. It is 
insoluble in water, but soluble in an excess of phos 
phoric acid. When heated strongly in a crucible, a 
little phosphorus comes over, and phosphuret of silver 
remains in the retort *. 
Sp.6. Fluat of Siber. 
FLUORIC ACID does not attack silver ; but its oxide 
is partly dissolved by that acid, and partly forms with 
it an insoluble salt †. This acid precipitates the fluat 
of silver from the liquid nitrat in the form of a white 
heavy powder, which is supposed by some to resemble 
the appearance of muriat of silver. This salt is decom 
posed by the sulphuric acid. 
Sp. 1. Borat g Siber. 
BORACIC ACID has no action on silver whatever ; but 
the borat may be formed by pouring a solution of bo 
rax into liquid nitrat of silver. The salt falls to the 
bottom in the form of an insoluble white powder, which 
has not been examined. 
Sp. 8. Carbonat of Silver. 
CARBONIC ACID has no action whatever upon silver; 
but it is absorbed readily by the oxide of that metal. 
The carbonat may be obtained by precipitating silver 
from its acid solutions by means of a carbonated alkali. 
A white insoluble powder is obtained, which is carbo 
nat of silver. This salt becomes black when exposed 
to the light; and, when heated, the acid is driven off, 
* Fourcroy, vi. 340. 
Scheele, i. 32, 
G g3 
469 
Chap. II.