BARIUM. 121 



Pelouze 96.457, rfc .0036 



Marignac 96.360, .0024 



Dumas 96.316, db .0055 



Richards 96.520, .0025 



General mean .................... 96.434, .0015 



The ratio between silver and crystallized barium chloride has also 

 been fixed by Marignac.* The usual method was employed, and two 

 series of experiments were made, in the second of which the water of crys- 

 tallization was determined previous to the estimation. Five grammes of 

 chloride were taken in each determination. The following quantities of 

 BaCl 7 .2H 2 O correspond to 100 parts of silver : 



113.109") 

 A. J 113.135 V Mean, 113.114 



- 



B. J 113.122 V- Mean, 113.106 

 (113.060) 



Mean, 113.110, .0079 



The direct ratio between the chlorides of silver and barium has been 

 measured by Berzelius. Turner, and Richards. Berzelius t found of 

 barium chloride proportional to 100 parts of silver chloride 



72.432 

 72.422 



Mean, 72.427 



Turner J made five experiments, with the following results : 



72.754 

 72.406 

 72.622 

 72.664 

 72.653 



Mean, 72.680, .0154 



Of these, Turner regards the fourth and fifth as the best ; but for 

 present purposes it is not desirable to so discriminate. 



Richards' determinations fall into three series, and all are character- 

 ized by their taking into account chloride of silver recovered from the 

 wash waters. In the first series the barium chloride was ignited at low 

 redness in air or nitrogen ; in the second series it was fused in a stream 

 of pure hydrochloric acid ; and in the third series it was not ignited at 

 all. In the last series it was weighed in the crystallized state, and the 



* Tourn. fur Prakt. Chem., 74, 212. 1858. 



t Poggend. Annalen, 8, 177. 



t Phil. Trans., 1829, 291. 



\ Proc. Amer. Acad., 29, 55, 1893. 



