418 
DR. JOHN STENHOUSE ON THE ACTION OF 
Nitropopulate of Silver. 
The silver salt was prepared by dissolving oxide of silver in a hot solution of pure 
nitropopulic acid. On the cooling of the liquid the salt was deposited in small hard 
granular crystals, which were dried at 212°, and subjected to analysis. 
0‘448 grm. of salt gave 0*190 chloride of silver=0*1536 oxide of silver. 
I. 0*6205 grm. of salt gave 0*562 carbonic acid and 0*055 water, 
II. 0*379 grin, of salt gave 0*347 carbonic acid and 0*031 water. 
Calculated numbers. 
I. 
II. 
C 14 
1050*00 
25*07 
24*70 
24*97 
H 3 
37-50 
00*89 
00*98 
00*90 
N 2 
350*50 
0 13 
1300*00 
AgO 
1449*01 
34*60 
34*28 
4187*01 
Nitropopulate of Soda. 
This salt was prepared by exactly saturating a hot solution of nitropopulic acid with 
carbonate of soda. On the cooling of the liquid the soda salt was deposited in small 
acicular crystals, which, like the potash salt, were very slightly soluble in cold water. 
0*1700 grm. of salt dried gave 0*048 sulphate of soda=0*0209. NaO= 12*29 
per cent. 
Calculated. Found, 
C 14 1050*00 
H 3 37*50 
N 2 350*50 
O 13 1300*00 
NaO 387*00 12*39 12*29 
3125 
The nitropopulate of ammonia is prepared in exactly the same way as the potash 
and soda salts, and its solubility and reactions are very similar to theirs. 
The neutral baryta salt is readily formed by adding a hot solution of baryta to a 
hot solution of nitropopulic acid. The addition of the baryta is cautiously continued 
so long as the precipitate which falls is redissolved on shaking the flask. The filtered 
liquid deposits, on cooling, small granular crystals, which, after being dried in vacuo 
and afterwards in the water-bath, appear to have the following composition : — 
0*231 grm. salt, when treated with sulphuric acid, gave 0*091 BaO 803 = 0*0597 
BaO= 25*84 per cent. 
Calculated numbers. Found. 
C 14 1050* 
H 3 37-50 
N 2 350*50 
O 13 1300*00 
BaO 954*85 
3692 00 
25*85 
25*84 
