§2 DETERMINATION OF COPPER. 



Performing the same calculations upon these figures as in the pro- 

 ceeding case we have : 



Silver precipitated by 1 gram of material. 



Grams. 



calculated 3. 2217 



Found 3 - i:,: '' 1 



Deficiency 0.0686 



0.0686Ag=2.01 per cent, copper not precipitating Ag 

 Cu present as Gu,0 8.658-63.4=0.1366 4.309 



Cu not precipitating silver 2. 01 -f-63. 4=0. 0317 1 



The conclusion arrived at from these figures is that, when copper i 

 containing Cu,0 is treated with a neutral solution of AgXO ;J in excess = 

 in the cold, all the Cu 2 is converted into the insoluble basic nitrate. 

 H 6 Cu 4 N 2 12 . 



