86 
CHLORIDE OF AMMONIUM IN CHEMISTRY. 
strongly, decreases somewhat in weight on treatment with 
chloride of ammonium ; but by long ignition it attains such 
a state of density as to withstand the action of sal-ammo- 
niac. Crystallized silicate of soda in the anhydrous state is 
barely decomposed by ignition with chloride of ammonium. 
Phosphates. — Phosphate of soda, calcined with chloride 
of ammonium, increases in weight; however, the weight of 
the residue diminishes by further treatment with sal-ammo- 
niac, but still remains greater than that of the phosphate 
employed. A partial decomposition takes place ; chloride 
of sodium is formed, and some phosphoric acid is expelled 
as hydrochloric acid by the phosphoric acid under the influ- 
eace of the air and moisture, whence the alternating increase 
and decrease in weight. Phosphate of lime is not decom- 
posed by ignition with sal-ammoniac. 
Compounds of Antimony. — The author has already 
shown that the antimony can be entirely expelled from the 
alkaline antimoniates by chloride of ammonium, and the 
alkali determined with accuracy as chloride. The com- 
bination of the alkaline sulphurets, especially the sulphosalt, 
consisting of snlphuret of sodium and sulphuret of antimony, 
commonly known by the name of Schlippe's salt, may be 
exceedingly well analysed by chloride of ammonium. In 
the case of this salt, pure chloride of sodium was left entirely 
free from every trace of antimony and sulphur. 
Jirseniates. — That alkaline arseniates are most readily 
converted by chloride of ammonium into alkaline chlorides 
has been already shown. The arseniate of lime, after cal- 
cination, leaves chloride of calcium, but the arseniate of 
magnesia is scarcely affected by treatment with sal-ammo- 
niac. Sulphate of ammonia appears to decompose it en- 
tirely ; however, this ammonical salt is not so well adapted 
for analytical purposes, as it fuses when heated and froths 
violently, rendering it difficult to prevent the mass flowing 
over the crucible. 
Borates. — Borax is not affected by calcination with sal- 
