CARBOX. 75 



With silver benzoate, C 7 H 5 Ag0 2 , Karelin's results are as follows : 



.40858 grm. benzoate gave .19255 Ag. 47. 127 per cent. 



.46674 " -21999 " 47.133 " 



.48419 " .22815 " 47.120 " 



.62432 .29418 " 47.120 " 



.66496 " .3!34Q " 47-I3I " 



.75853 -35745 " 47.i 2 4 " 



.76918 .3 62 47 " 47.124 " 



.81254 " .38286 " 47.H9 " 



.95673 " .45079 " 47."8 " 



1.00840 " .47526 " 47- I 3 " 



Mean, 47.125, .0012 



A different method of dealing with organic silver salts was adopted 

 by Maumene,* in 1846, for the purpose of establishing by reference to 

 carbon the atomic weight of silver. We will simply reverse his results 

 and apply them to the atomic weight of carbon. He effected the com- 

 bustion of the acetate and the oxalate of silver, and, by weighing both 

 the residual metal and the carbon dioxide formed, he fixed the ratio 

 between these two substances. In the case of the acetate his weighings 

 show that for every gramme of metallic silver the weights of CO 2 were 

 produced which are shown in the third column : 



8.083 grm. Ag= 6.585 grm. CO 2 . -8147 



11.215 " 9-J35 " -8136 



I4.35 1 " H.6935 " -8148 



9.030 7.358 " .8148 



20.227 " 16.475 " .8145 



Mean, .81448 



The oxalate of silver, ignited by itself, decomposes too violently to 

 give good results ; and for this reason it was not used by Liebig and 

 Redtenbacher. Maumene, however, found that when the salt was mixed 

 with sand the combustion could be tranquilly effected. The oxalate 

 employed, however, with the exception of the sample represented in the 

 last experiment of the series, contained traces of nitrate, so that these 

 results involve slight errors. For each gramme of silver the appended 

 weights of C0 2 were obtained : 



14,299 grm. Ag. = 5.835 grm. CO 2 . .4081 



*Ann. Chim. Phys. (3), 18, 41. 1846. 



