

OF SILVER. t-07 



1 atom sulphuric acid . 5 

 1 atom oxide of silver 14-75 



19-75 



3. Carbonate of silver. This salt is easily ob- Carbonate, 

 tained by mixing together solutions of nitrate of 

 silver, and an alkaline carbonate. It constitutes 



a white insoluble powder, with a slight shade of 

 blue. When this salt is mixed with dilute ni- 

 tric acid, a pretty rapid effervescence takes place, 

 owing to the escape of the carbonic acid gas, 

 and a colourless solution is obtained. I found 

 that 38*7 grains of carbonate of silver yielded 

 47*87 grains of fused nitrate of silver. This is 

 equivalent to 32*841 grains of oxide of silver. 

 Now, 1475 : 2-57 : : 32-841 : 6-122 = carbonic 

 acid united to the oxide of silver. But, 32-841 

 + 6-122 = 38-963, which rather exceeds the 

 weight of carbonate of silver employed. It is 

 obvious from this that the salt is anhydrous, and 

 that its constituents are 



t 



1 atom carbonic acid . 2-75 

 1 atom oxide of silver . 14-75 



17'5 



4. Phosphate of silver. When nitrate of silver Phosphate, 

 and phosphate of soda are dissolved in separate 

 portions of water, and the solutions are mixed, 



there falls down a fine yellow coloured precipi- 



Cc 4 



