190 



Mean, 96.512, ± .0055 



In the second series of experiments a small excess of silver was added 

 as before, and the precipitate of silver chloride was removed by filtra- 

 tion. The filtrate and wash waters were concentrated to small bulk, 

 whereupon a trace of silver chloride was obtained and taken into account. 

 The excess of silver remainino- was then thrown down as silver bromide, 

 and from the weight of the latter the silver was calculated, and sub- 

 tracted from the original amount. 



Ag. BaCL. Ratio. 



6.59993 6.30974 96.512 



5.55229 5.36010 96.539 



4.06380 3.92244 96.522 



Mean, 96.524, ± .0054 



The third series involved mixing solutions of barium chloride and 

 silver in as nearly as possible equivalent amounts, and then determining 

 the actual quantities of silver and chlorine left unprecipitated. The 

 filtrate and M^ash waters were divided into two portions, one-half being 

 evaporated with hydrobromic acid and the other with silver nitrate. 

 The small amounts of silver bromide and chloride thus obtained were 

 determined bv reduction and the use of Volhard's method : 



in the first series, with variations and greater refinement in the observa- 

 tion of the end point. The results were as follows : 



Ag. BaCh. Ratio. 



6.7342 6.50022 96.525 



10.0023 10.23365 96.523 



Mean, 96.524, ± .0007 



