on the Ammonia-cobalt Bases. 251 
Solution containing the nitrate of Lut t and nitrate of am- 
mo The quantity of Luteocobalt is small in 
5NH3s.Co203, 3NOs=Co20s +8N+15HO, 
In point of fact, however, the decomposition is less simple, as 
vapors are always evolved. f 
When a current of NOx is passed through a solution of nitrate 
of Roseocobalt a rapid absorption takes place, and after a short 
time crystals of nitrate of Xanthocobalt are deposi 
Solution of sulphurous acid converts the nitrate of Roseo- 
cobalt, at first into an orange-colored compound containing SOs, 
and afterward reduces this completely to nitrate and sulphate of 
Cobalt and nitrate of ammonia. 
Nitrate of Roseocobalt has the formula 
5NHs.Coz20s, 3NOs, 
as the following analyses show: 
0°2308 grs. gave 0: cobalt == 17:82 per cent t, 
cietgeere one gn te 
01448 grs. gave 0.0681 “ « =1790 > * “ 
0°9370 grs. gave 03915 grs, water = 464 per cent hydrogen. 
06632 ve 0 2862 “ = 4°79 a“ “« 
27312 e¢11258¢rs.  “ = 4657 e ee 
grs, gave 168 ¢.c. nitrogen at 24° C. and 76631 (at 24°°5) = 150°54 
c.¢, ° am ost i cel 
»¢, at 0° and 760 33 pn ink 164098 at (139-8) = 200°55 
c. at 0° and 760%” == 34°03 per cen 
Eqs. Calculated: Mean. 
Cobalt, 2 590. 1787 17-88 1782 1792 1790 
Hydrogen, 15 150 4°85 460 464 479 457 
Nitrogen, 8 112:0 33-93 34-01 3398 3403 ——_ 
Oxygen, 18 1440 4865 43°51 —_—_ 
830°0 100-00 10000: 
