252 Dr. E. J. Mills on certain Cobaltamines. 



Action of Water on Cobaltic fi-Pentammoniotrichloride. — I have 

 examined this reaction as it occurs in sealed tubes when heat is 

 applied continuously for a long time. The experiments and their 

 results were, qualitatively, exactly the same as in the case already 

 discussed ; and I have to report that the analogous equation 



2[5NH 3 .CoCl 3 ] + (3 + 7i)H 2 = Co 2 3 .wH 2 



+ 6(NH 3 .HC1)+4NH 3 



proved as untrue to fact as its predecessor. 



07566 grm. of the brown-black precipitate, dried over oil of 

 vitriol for six weeks, yielded, on treatment as described in the 

 previous section, 0*0865 grm. water, 0-0940 grm. silica, and 

 1*1273 grm. cobaltic sulphate. 





Found. 







A 



r,o 4 o 5 



Cobalt . 



. 57-31\ T75-25 

 . 18-84/ \2475 



75-00 



Oxygen 



25-00 



Silica . 



. 12-42 





Water . 



. 11-43 





10000 10000 100-00 



The cobaltic oxide here formed is obviously identical in com- 

 position with that which is produced, under similar circum- 

 stances, from the hexammoniochloride. The action itself, how- 

 ever, is generally slower and less complete than before, in con- 

 sequence of the slight solubility of cobaltic pentammoniotrichlo- 

 ride in a weak ammoniacal solution of sal-ammoniac, wherein 

 the hexammoniochloride dissolves with facility. On this account, 

 the filirate from the brown-black oxide does not readily yield up 

 all its chlorine on ebullition with hydric and argentic nitrate ; 

 and the total ammonia could not be estimated by the usual pro- 

 cess with platinic chloride. I will give two chlorine determina- 

 tions which will prove the former point, and some determinations 

 of the ammonia which is set free. 



(1) 0*9952 grm. purpureochloride was heated with 50 cubic 

 centims. water in a sealed tube for forty-eight hours at 80°-100°; 

 200 cubic centims. of the nitrate (1000 cubic centims.) gave 

 0'3285 grm. argentic chloride. 



(2) 0-3000 grm. substance and 10 cubic centims. water, at 

 90°-130° for forty-three hours, gave # 4618 grm. argentic 

 chloride. 



(3) 100 cubic centims. of the nitrate in (1) contained 0*01003 

 grm. free ammonia. 



(4) 0*4015 grm. substance and 10 cubic centims. of water, at 

 100° for forty-two hours, furnished 00459 grm. free ammonia. 



