﻿464 
  Wells 
  and 
  Foote 
  — 
  Certain 
  Double 
  Halogen 
  

  

  It 
  is 
  interesting 
  to 
  notice 
  that 
  Benedict* 
  has 
  described 
  the 
  

   potassium 
  salt 
  2KC1 
  . 
  SbCl 
  3 
  . 
  SbOCl, 
  which 
  corresponds 
  exactly 
  

   to 
  this 
  rubidium 
  compound. 
  

  

  3. 
  The 
  C 
  cesium- 
  Bismuth 
  Chlorides 
  and 
  Iodides 
  

  

  The 
  double 
  chlorides 
  of 
  bismuth 
  with 
  caesium 
  have 
  been 
  

   described 
  by 
  Remsen 
  and 
  Brigham.f 
  These 
  authors 
  did 
  not 
  

   state, 
  however, 
  how 
  widely 
  the 
  conditions 
  had 
  been 
  varied, 
  and 
  

   we 
  have 
  repeated 
  the 
  work, 
  varying 
  the 
  proportions 
  of 
  caesium 
  

   and 
  bismuth 
  as 
  much 
  as 
  possible, 
  and 
  have 
  found 
  exactly 
  the 
  

   same 
  salts 
  as 
  described 
  by 
  them. 
  These 
  salts 
  are, 
  

  

  3CsCl 
  . 
  BiCl 
  3 
  

   3CsC1.2BiCL 
  

  

  SCsCl. 
  BiCl 
  s 
  . 
  — 
  This 
  salt 
  forms 
  in 
  colorless 
  plates 
  when 
  50 
  g 
  

   of 
  caesium 
  chloride 
  are 
  mixed 
  in 
  hydrochloric 
  acid 
  solution 
  

   with 
  from 
  1 
  — 
  25 
  g 
  of 
  bismuth 
  chloride. 
  The 
  analyses 
  were 
  

   made 
  on 
  samples, 
  dried 
  but 
  a 
  short 
  time 
  in 
  the 
  air, 
  which 
  

   apparently 
  contained 
  a 
  little 
  mechanically 
  included 
  water. 
  The 
  

   following 
  results 
  were 
  obtained 
  : 
  

  

  Calculated 
  for 
  

   I. 
  II. 
  3.CsCl 
  . 
  BiCls. 
  

  

  Bi 
  24-80 
  24'47 
  25*36 
  

  

  Cs 
  47*94 
  48-66 
  

  

  CI. 
  25-98 
  

  

  3CsCl.2BiCl 
  z 
  . 
  — 
  When 
  50 
  g 
  of 
  bismuth 
  chloride 
  are 
  mixed 
  

   with 
  from 
  l-80 
  g 
  of 
  caesium 
  chloride, 
  the 
  salt 
  SCsCl. 
  2BiCl 
  8 
  

   crystallizes 
  in 
  light 
  yellow 
  needles, 
  sometimes 
  broadened 
  and 
  

   looking 
  like 
  plates 
  and 
  again 
  much 
  shorter 
  and 
  thicker. 
  

  

  The 
  following 
  analyses 
  were 
  made 
  : 
  

  

  Calculated 
  for 
  

   I. 
  II. 
  3CsCl 
  . 
  2BiCl 
  3 
  . 
  

  

  Bi 
  ,... 
  36-99 
  36-58 
  36'67 
  

  

  Cs 
  34-69 
  34-94 
  35*17 
  

  

  CI 
  28-16 
  

  

  3CsI.2Bil 
  r 
  C 
  cesium- 
  Bismuth 
  Iodide. 
  

  

  We 
  could 
  obtain 
  only 
  one 
  double 
  iodide 
  of 
  bismuth 
  and 
  

   caesium, 
  although 
  the 
  proportions 
  of 
  caesium 
  and 
  bismuth 
  were 
  

   varied 
  greatly. 
  The 
  salt 
  formed 
  as 
  a 
  crystalline 
  precipitate, 
  

   difficultly 
  soluble 
  especially 
  in 
  an 
  excess 
  of 
  caesium 
  iodide, 
  

   when 
  l 
  g 
  of 
  bismuth 
  iodide 
  was 
  added 
  to 
  50 
  g 
  of 
  caesium 
  iodide 
  

   and 
  when 
  l 
  g 
  of 
  caesium 
  iodide 
  was 
  added 
  to 
  50 
  g 
  of 
  bismuth 
  

   iodide. 
  With 
  an 
  excess 
  of 
  caesium, 
  the 
  color 
  was 
  a 
  bright 
  red, 
  

  

  * 
  Proc. 
  Am. 
  Acad., 
  xxix, 
  212. 
  f 
  Amer. 
  Chem. 
  Jour., 
  xiv, 
  179. 
  

  

  