188 
IOWA ACADEMY OF SCIENCE 
.1173 g. silver salt gave .0362 g. silver. 
Theory for CsH^OsNsS.Ag 
Silver, 30.92 per cent. 
Found 
30.87 per cent. 
Potassium Salt of the Imlde. 
CO 
( 1 ) 
NO„o • CHs • CeH: 
4 
5 
■ / \- 
/• 
N • K 
so. 
( 2 ) 
The potassium salt of the imide, which is much more soluble 
than either the silver salt or the original imide, is made by 
treating the ammonium salt of the imide in hot, quite concen- 
trated solution with an excess of strong potassium carbonate. 
An immediate crystalline precipitate appears, which may come 
down more slowly from more dilute solution. It can be re- 
crystallized from water as there is considerable difference be- 
tween its solubility in hot and cold water. The mother liquors 
and wash waters if acidified give' the free imide, and in this way 
the material may be saved. The potassium salt crystallizes in 
peculiar shaped plates, which are sometimes rosetted together, 
but often occur separately. 
Fig. 7. 
The figures given, figure 7, excepting the last one, are all 
double, as the rosetting, when such occurs, takes place at the 
middle of the figures shown above, ie., along the dotted line. The 
second crystallization gave a solution free from alkali. It has 
a weak bitter taste. There is no water of crystallization. Potas- 
sium was determined as potassium sulphate in the manner de- 
scribed for the silver salt. 
.1610 g. potassium salt imide gave .0499 g. potassium sulphate. 
Theory for CgHsOsNsS K Found 
Potassium, 13.96 per cent. 13.91 per cent. 
B. From the Unsymmetrical Chloride . — If the acid chloride 
melting at 83° is treated with cold concentrated ammonia, an ac- 
tion takes place which while beginning slowly, at last goes on 
rapidly with the evolution of heat. The behavior in this respect 
