92 H. L. Wheeler — Double Halides of 



A well crystallized product of the double caesium salt was 

 obtained by preparing the salt in the presence of considerable 

 alcohol. Analysis of these compounds gave 







Calc. for 

 30sI.2AsI 3 







Calc. for 

 3RbI.2AsI 8 



Cs._. 



As._. 



. ._ 24-38 

 .._ 8-92 

 ... 67-23 



23-58 



8-87 



67-55 



Rb ... 



As ... 

 I 



... 16-86 

 ... 9-96 

 ... 73-65 



16-55 

 10-60 968 



73-77 



An attempt was made to prepare potassium arsenious chlo- 

 ride by mixing solutions of potassium chloride and arsenious 

 acid, saturated solutions of these substances in concentrated 

 HC1 being used for the purpose. No precipitate was thus 

 produced, and, on concentrating the solution, potassium chlo- 

 ride was deposited. Aqueous solutions of potassium chloride, 

 when added to solutions of arsenic trioxide in concentrated 

 HC1, gave precipitates consisting chiefly of As 2 O s . Analogous 

 experiments with potassium bromide and arsenious bromide 

 gave similar results, and operating in the same way with KI 

 and Asl 3 in concentrated HI solutions, nothing but crystals of 

 Asl 3 or mixed crops of Asl 3 and KI were obtained. Similar 

 negative results, in respect to the formation of double halides 

 of ammonium and arsenic, have been obtained by Wallace, f 



Compounds of Arsenic Trioxide with Alkaline Halides, 

 CsCl . As^O z and Kb CI . Asf) % : — When a hot saturated aqueous 

 solution of 25 grams of caesium chloride was saturated with 

 3CsCl . 2AsCl 3 , a finely divided white precipitate was formed on 

 cooling, (Analysis 1.) When 6*5 grams of the double chloride 

 were dissolved in 800 cc of a cold-saturated solution of As 3 3 in 

 HC1 of sp. gr. 1*1 by the aid of heat, a similar precipitate was 

 obtained (analysis 2). Products intermediate in composition 

 were obtained by recrystallizing the double halide from water 

 (analysis 3), from 10 per cent HC1 (analysis 4) and from L5 

 per cent HC1 (analysis 5). 



Cs_... 



.. 41 



•51 



41-85 41 



75 



4180 



25-56 34-29 



As ... 



_. 35 



•59 



34-58 35-37 





47-64 43-05 



Cl._._ 



.. 11-46 



11-31 





11-64 8*86 



.... 



.,[11 



•44] 



[11-57] 





[15-16] [13-80] 















Calculated for 









4. 





5. 



CsCl. As 2 3 



Cs._ 







... 35-30 





33-92 



36-29 



As . 







.. 39-14 





38-10 



40-93 



CI . 







... 10-63 





11-42 



9-68 



.. 







. [14-93] 





[16-56] 



13-10 





t 



Phil. 



Mag. IV, xvi, 



358 



; xvii, 122, 



261. 



