ATOMIC WEIGHTS 



125 



Mean, 87.232, ± .0017 

 THE SILVER CARBOK RATIOS. 



The detennination of atomic weights by the analysis of organic silver 

 salts has been repeatedly attempted. The measurements of this class 

 may, for present purposes, be conveniently grouped together. 



In 1840 Eedtenbacher and Liebig' sought to determine the atomic 

 weight of carbon, that of silver being assumed as known, by analyses of 

 the acetate, tartrate, racemate and malate of silver. There were five 

 determinations with each compound, the salt being ignited, and the 

 residual silver weighed. From one to nine grammes of material were 

 used in each experiment. 



In the acetate the following percentages of silver were found : 



64.615 

 64.624 

 64.623 

 64.614 

 64.610 



Mean, 64.6172, ± .0018 



After applying corrections for weighing in air, this mean becomes 

 61.6006. 



In the tartrate the silver was as follows: 



59.297 



59.299 



59.287 



59.293 



59.293 



Mean, 59.2938, ± .0014 

 Or, reduced to a vacuum, 59.2806 



In the racemate we have 



59.290 

 59.292 

 59.287 

 59.283 

 59.284 



Mean, 59.2872, 

 Or, corrected, 59.2758 



.0012 



^ Ann. Chem. Pharni., 3S, 113. 1S41. Mom. Chem. Soc, 1, 9. Phil. Mag. (3), 19, 210. 



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