ON REAGENTS AND THEIR USES. 
93 
Hydrochloric Acid, for dissolving oxides, separating them 
from their compounds,— -and precipitating silver. 
Sulphuret of Antimony, or Prolosulphuret of Iron-, for 
making Hydrosulphuric Acid, used in organic analyses to 
obtain and separate the organic acids from the insoluble com- 
pounds formed with protoxide of lead. 
Nitric Acid. — As a solvent of metals, separating their al- 
loys, decomposing the phosphates and tartrates, and detecting 
the presence of ammonia, &c. 
Oxalic Acid, for precipitating lime, &c. 
Distilled Sulphuric Acid, for decomposing neutral salts, 
detecting lead in vinegars, and discovering baryta in mineral 
waters. 
Sulphurous Acid, for precipitating sulphur from sulphur- 
etted hydrogen, &c. 
Lime Water, for detecting carbonic acid, &c. 
Aqua Ammonia, to precipitate metallic oxides from their 
solutions, or to redissolve the soluble, and separate from the 
insoluble oxides — also to precipitate vegetable alkaloids. 
Watery Solution of Baryta, for detecting sulphuric acid, 
and ascertaining its proportion, &c. 
Carb. Potassa, to test lime water, and precipitate metallic 
oxides from the sulphates, and earths from the muriates. 
Chloride of Barium, for detecting the presence of sul- 
phates in mineral waters. 
Pure Potassa and Strontia, in the dry state for decom- 
posing salts of earthy or metallic bases by calcination. 
Solution of Pure Potassa, for a multitude of opera- 
tions. 
Prussiate of Potash, for detecting iron in solutions, and 
the presence of copper in mineral waters. 
Nitrate of Silver, for detecting hydrochloric acid, and to 
show the presence of muriates and sulphates in solutions. 
Hydrosulphate of Ammonia detects many of the metals, 
and separates them from alkaline and earthy salts. 
Nitrate of Mercury discovers the carbonates of lime, soda, 
