Re eae ee Oe NN a ee Ee EE Be Ne Rene ee eesEs aS 
Ce a ee ee ee ee ogee een ey ee ae ae ees 
eT ae ee Eres i i 
. * , ae 
Ammonia, Picrie Acid and Metallic Bases. 61 
The silver falls below, and the ammonia exceeds the caleula- 
ted amount in consequence of the impossibility of obtaining the 
salt quite free from admixed picrate of ammonia. 
This beautiful salt appears to be one of the most permanent 
of this very unstable class of substances. It dissolves readil 
in hot water containing ammonia, sparingly in cold, and erystal- 
lizes in fine needles from the hot solution. Heated on platinum 
foil it detonates and leaves a brilliant spot of metallic silver. 
Ammonia-picrate of copper. 
* A cold saturated solution of picrate of ammonia added to an 
ammoniacal solution of sulphate or nitrate of copper, immediately 
throws down an abundant precipitate which after washing with 
strong solution of carbonate of ammonia and afterward with 
ilute ammonia exhibits a beautiful pale greenish yellow color 
with a shade of red through it. Itis in fine scales and much 
resembles the dust ‘of the wings of butterflies. 
_ Analysis gave for this salt a constitution similar to that of the 
silver salt. — 
6059 gms. substance gave °4652 picric acid. 
9 “ “6 ce 
1279 oxyd of copper. 
14240 & “ +1577 metallic copper. 
"6059 « . “ +2190 chlorhydrate of ammonia. 
The copper was determined in the one case by. precipitating 
the cupric solution while boiling with hyposulphite of soda, dis- 
solving in aqua regia, evaporating to dryness, redissolving in 
dilute chlorhydrie acid, and precipitating with distilled zinc and 
estimating as metallic copper—in the other by precipitating at 
2° by caustic soda. oes 
These results lead to the formula :— 
eNH,0u0.C,, snd, 4° 
Dried over sulphuric acid in vacuo:— 
. Caleulated. : Found. 
2, Mean. — 
C,,H.N.O. 77-63 76:44 76°44 
ars or Ae 
Cu 10°79 10:97 11:07 11-02. 
2NH, 11:58 11°52 Be ie 
100-00 
In an experiment to ascertain whether all the moiste | 
Temoved by drying in vacuo over SO,, a quantity of two. 
grammes by exposure to a temperature of 210° to 212° for 9 
hours in the exsiccator lost a little less than one and a half 
- At Jour. Sct.—Szconp Suntes, Vor. XXXI, No. 1.—Jay., 1861 - 
ee XxX bi : 
