Dr. Turner on the Composition of Chloride of Barium. 187 



Chloride of Barium. Chloride of Silver. 

 Exp. 1. lOOyielded 137*45 



2. 100 137-54 



3. 100 137*70 



4. 100 13762 



5. 100 137-64 



Though all these analyses were made with great care, the 

 last two were the most successful, as being less influenced by 

 errors of manipulation than the others. Instead, therefore, of 

 taking the mean of the five, which is 100 to 137*61, I adopt 

 the mean of the two last experiments, which is 100 to 137'63. 

 In one of these the precipitate was washed with distilled water 

 only, and in the other with water acidulated with nitric acid. 

 Berzelius in his experiments on this subject found that 100 

 parts of chloride of barium corresponded to 138 - 06 in one 

 experiment, and 138*08 in another. This is the only material 

 difference between us which I have yet had occasion to notice. 

 It induced me to reconsider every part of my experiments ; 

 but as I am unable to detect the slightest inaccuracy in the 

 two analyses from which my result was derived, I cannot 

 hesitate to adopt it. I conclude, accordingly, that 100 parts 

 of chloride of barium correspond to 137*63 parts of chloride 

 of silver; and as, consistently with the preceding researches, 

 this quantity of hornsilver contains 34*016 parts of chlorine, it 

 follows that chloride of barium consists of 



Barium 65*984 



. Chlorine 34-016 



100*000 

 Its constitution according to Dr. Thomson and Berzelius is 

 shown by the following numbers : 



Thomson. Berzelius. 



Barium 66*037 65-926 



Chlorine 33'963 34-074 



100-000 100-000 



It is impracticable, from the composition of chloride of 

 barium as above stated, to make any satisfactory inference 

 relative to the real equivalent of barium, because the real 

 equivalent of chlorine is not yet clearly ascertained. By Dr. 

 Thomson it is estimated at 36, and by Berzelius at 35*43; and 

 on calculating the equivalent of barium according to both 

 estimates, the following result will be obtained. 



Barium 69 832 68-726 



Chlorine 36-000 35*430 



105*832 104-156* 



* Another recent analysis of chloride of barium will be found in our last 

 volume, p. 277. — Edit. 



2 B 2 Hence 



