^4 CHLORIDE OF AMMONIUM IN CHEMISTRY, 
na, calcined with chloride of ammonium, is volatilized with- 
out leaving a residue. 
Potash alum is completely decomposed ; however, it does 
not leave pure chloride of potassium, but the sparingly vo- 
latile double compound of chloride of aluminum and chlo- 
ride of potassium. 
Glucina. — The compounds of this earth closely resemble 
those of alumina in their behaviour towards chloride of 
ammonium. The loose carbonate of glucina is more quick- 
ly decomposed by chloride of ammonium than the earth 
precipitated by ammonia ; but even the former cannot be 
entirely volatilized by frequent treatment with chloride of 
ammonium. The more frequently the earth is heated to 
redness, the more it resists further decomposition. 
Peroxide of Iron. — When mixed with chloride of am- 
monium and heated to redness, the mixture fuses, and read- 
ily flows over the crucible. A considerable quantity of iron 
is volatilized in red vapours as perchloride; and on the sides 
of the crucible peroxide of iron is deposited in a crystalline 
state, produced from the chloride by oxidation. 
Manganese. — The oxides of this metal are converted, by 
treatment with chloride of ammonium, into protochloride, 
in which by oxidation some protoperoxide is formed. 
Oxide of Nickel and Cobalt are converted into the me- 
tallic state when calcined with chloride of ammonium. The 
arseniuret of nickel (Nickelspeise) is, on the contrary, only 
partially decomposed, the arsenic being volatilized and the 
nickel left as chloride. 
Oxide of Bismuth is reduced, with a lively deflagration, 
to metallic bismuth. 
Silver Compounds. — Chloride of silver, mixed with 
chloride of ammonium and calcined, experiences no change; 
oxide of silver, heated to redness with chloride of ammoni- 
um, leaves both metallic silver and chloride. By the first 
action of the heat a portion of the oxide is reduced to me- 
tallic silver, which is not altered by ignition with sal-ammo- 
