248 COMPOSITION AND PRODUCTS OF 



zinc, or neutral acetate of lead. With the basic acetate of lead 

 a precipitate is formed, which is soluble in an excess of the 

 lead-salt. 



0.8645 gramme of this acid burnt with the bioxide of copper 

 gave 0.666 carbonic acid and 0.230 water. In 100 parts 



. Carbon 50.20 



Hydrogen 7.00 



Oxygen 42.80 



100.00 



The> silver-salt is easily formed by double decomposition with 

 the ammoniacal salt and nitrate of silver. It is slightly soluble 

 in water and not easily altered by the action of light. 



Exp. 1. — 0.525 gramme of this salt when burnt gave 0.294 

 gramme silver. 



Exp. 2. — 0.612 gramme of this salt when burnt gave 0.343 

 gramme silver. 



These give in 100 parts 



1. — 56.01 silver, or 60.00 oxide of silver. 

 2.— 56.05 •• 60.19 



Burnt with the bioxide of copper : 



Exp. 1. — 0.708 gramme of silver-salt gave 0.582 gramme 

 carbonic acid and 0.174 gramme water. 



Exp. 2. — 0.787 gramme of silver-salt gave 0.6465 gramme 

 carbonic acid and 0.190 gramme water. 



These experiments give the following percentage: 



1 2 Mean. 



Carbon 22.56 22.60 22.58 



Hydrogen 2.68 2.68 2.68 



Oxygen 14.67 14.63 14.65 



Oxide of silver 60.09 60.09 60.09 



100.00 100.00 100.00 



Out of this the following formula of a bibasic salt is calcu- 

 lated : In 100 parts. 



Atomic weight. Calculated. Found. 



14 atoms Carbon 84.95 22.18 22.58 



10 •• Hydrogen 10.00 2.66 2.68 



7 •• Oxygen 56.00 14.65 14.65 



2 •• Oxide of silver 232.25 60.51 60.09 



383.20 100.00 100.00 



This formula agrees with that of adipinate of silver, as made 

 out by Eromeis, with the unimportant difference of one atom 



