RICHARDS AND FORSYTHE. — ACTION OF AMMONIA. 241 



The gains were then 17.8 per cent and 17.0 per cent of the weight of 

 substance taken, while the formula Cu(C2H302)o4 NH^, requires a gain 

 of 15.8 per cent. Here again the error is due to the great hygroscopic 

 power of the resulting compound, — which absorbed all of the traces of 

 water in the ammonia, — as well as to the fact that the tube had to be 

 weighed while very cold. Since the errors in an analysis of the final 

 compound must necessarily, as before, be in the opposite direction to the 

 errors just cited, the following analysis was made: (6) 1.208 grams of 

 substance required for neutralization 18.75 cubic centimeters of normal 

 acid, thus having contained 26.5 per cent of ammonia. The theoretical 

 amount corresponding to Cu(NH3)2 (C2H302)o2NHs is 28.0 per cent. 

 Greater exactness than this would have demanded great elaboration of 

 experimental detail, on account of the excessive instability of the com- 

 pound. 



These analyses and syntheses afford conclusive evidence that the com- 

 pound diammou cupriammonium acetate exists, and that it, together with 

 the most highly aramoniated cupriammonium bromide, is formed by the 

 action of ammonia upon cupriammonium acetobromide. 



VOL. XXXII. — 16 



