re ¢ 
80 _ MM. C. Lea on New Combinations of 
pia another portion the metallic oxyd was found by appropri- 
means. 
@ As far as examined, the ammonia-picrates all contain more 
than one equivalent of ammonia, and are represented either by 
the formula :— 
oNI,MO.C,, snd. ¢° or 8NH,2 [ m0. 0,, 9B jo} 
Ammonia-picrate of silver. 
Nitrate of silver dissolved in water and treated first with 
excess of ammonia, and the resulting clear solution mixed with 
cold saturated solution of picrate of ammonia gives a 
an abundant highly oe a yellow precipitate of amm 
nia-picrate of silver, which is to be thrown upon a filter, shall 
oughly washed with dilute read and dried in vacuo over 
sulphuric acid. 
Tt is to be observed that in the formation of this, as well as of 
# all the other salts here eco the metallic solution must inva 
rate. Hven with every precaution, it is difficult and in some 
cases apparently apne to obtain the ammonia-picrate per 
fectly free from this impur: 
daha 
*4245 substance gave ‘26382 picric acid. 
*5865 “ “cc “36 0 “ “ 
4245 i ” 157 7 chlorid of silver. 
"5865 od “ ad 
@10n “+4932 etdneiaaarusts of ammonia. 
This leads to the formula :— 
a «| 
gNH,AgOC, > 3x6, 4° 
Dried over sulphuric acid in vacuo :— ite 
Calculated. 
Found. < 
ae . 86 Mean. 
C,2H,N,0,,- - - 6162 61:73 61°11 61°42 
i a Ce 27°96 27°94 27°95 
OH, -. + - - + O10" 9-93 9°93 
100°00 99°62 99°30 
* See page 75. 
