274 



H. L. Wheeler — Double Halides of 





From 

 solution 

 6RbCl to 



lSbOU. 



From 

 solution 

 4RbClto 



!SbCl 3 . 



From 

 solution 

 IRbClto 

 lSbCl 3 . 



Sample 

 recrystal- 

 lized from 

 10#HC1. Average. Ratio. 



Rb 



38-98 38-55 



38-83 



38-62 



38-60 38-716 2-28 



Sb 



23-76 



23-98 



23-52 



23-81 23-767 1"00" 



CI 



37-16 36-97 







36-95 37-026 5'26 





Calculated for Calc. for 

 23RbCl . 10SbCl s . 16RbGl . 7SbCl 3 



Calc. for Calc. for 

 9RbCl . 4SbCl 3 . 7RbCl . 3SbCl, 





Rb 38-96 





38-85 



38-57 3921 





Sb 23-77 





23-86 



24-06 23-58 





CI 37-27 





37-29 



37-37 37-21 



It is to be noticed that this salt is formed under conditions 

 varying more widely than in the case of any of the other 

 double rubidium antimony chlorides. It can be exposed to 

 the air for several days without losing its luster ; on long expo- 

 sure it becomes covered with a white, opaque layer, probably 

 of antimony oxychloride. 



The Double Bromides. 



The bromides were obtained in the form of brilliant yellow, 

 six-sided plates, resembling the double arsenic bromides of 

 rubidium and caesium. They are comparatively stable in the 

 air, but on long exposure the crystals lose their luster. 



3 : % Rubidium Antimony Bromide, SRbBr. 2SbBr v — This 

 salt was obtained from dilute hydrobromic acid solutions when 

 the constituents were mixed in the proportion of two and 

 three-tenths and also four molecules of RbBr to one of SbBr„ 

 it was also the only one formed when antimony bromide was 

 present in the solutions in excess. It will be seen that a much 

 larger range of conditions exists for the preparation of the 

 salt 3RbBr.2SbBr 3 than in the case of the corresponding 

 double chloride. Moreover, the bromide can be recrystallized 

 unaltered from dilute hydrobromic acid. 



Analysis gave : 







From 



Sample 







From solutions From 



solution 



of latter 



Calculated 





containing a solution 



4 RbBr 



recrystal- 



for 





large excess of 23 RbBr . 



to 1 



lized from 



3 RbBr . 





SbBr 3 . to 10SbBr 3 . 



SbBr 3 . 



HBr. 



2SbBr 3 . 



Rb 



21-55 21-18 20-96 21-16 



21-53 



20-92 



21-08 



Sb 



20-07 20-13 19-98 



19-59 



19-91 



19-73 



Br 



59-30 





59-07 



59-19 



28 : 10 (?) Rubidium Antimony Bromide, 23 RbBr . 10SbBr t . 

 — This salt was obtained when dilute hydrobromic acid solu- 

 tions of rubidium and antimony bromides were mixed in the 



