P. T. Walden — Double Chlorides and Bromides, etc. 287 



Rubidium 



Iron 



Chlorine 



A. 



40-51 



13-28 



.. 41-91 



B. 

 40-69 

 13-33 

 41-92 



4-20 



Calculated for 

 Rb 2 FeCl 6 H 2 0. 



4044 

 13-29 

 42-01 



Water 



4-23 



■ 4-26 



Potassium 



Iron 



99-93 



A. 

 23-66 

 .. 16-86 



100-14 



B. 

 23-54 

 16-99 

 53-35 



5-96 



100-00 

 Calculated for 

 K 2 FeCl 6 H 2 0. 



23-73 

 16-98 



Chlorine . 



._ 53*56 



53-84 



Water 



6-20 



5-45 



Ammonium 



Iron . 



Chlorine 



100-28 



A. 

 .. 12-39 

 19-13 

 .. 61-21 



99-84 



B. C. 

 12-36 12* 

 18-95 

 61-07 61- 



100-00 



Calculated for 

 (NH 4 ) 2 FeCl 5 H 2 0, 



00 12-52 



19-48 



22 81-74 



Water 



. 7-39 



6-26 







100-12 100-00 



All these salts are well crystallized in short pristais. The 

 caesium and rubidium compounds are permanent in the air but 

 the potassium and ammonium salts absorb moisture quite 

 rapidly. 



1:1 Ccesium Ferric Chloride, CsFeCl^H„0. — This was 

 made from a solution containing 50 gr of csesium chloride and 

 180 gr of ferric chloride. Below are the analyses of separate 

 crops. 



Calculated for 

 A. B. C. CsFeCl 4 pi 2 0. 



Caesium 38*39 38*53 39-39 



Iron 17-03 16*85 16'48 



Chlorine 41*76 41-73 41*98 41*77 



Water 3-14 3*63 4*03 2*36 



100*32 100*74 



100-00 



This salt absorbs moisture in the air so rapidly that con- 

 siderable difficulty was experienced in preparing samples for 

 analysis. It is regarded as containing \ a molecule of water on 

 the evidence of the analytical results, although it is not 

 unreasonable to suppose that all the water found was absorbed, 

 especially as the bromide, CsFeBr 4 , is anhydrous. The crystals 

 were slender needles which rapidly lost their yellow color in 

 the air, turning red. 



