﻿Wells 
  and 
  Foote 
  — 
  Double 
  Halogen 
  Salts, 
  etc. 
  461 
  

  

  Aet. 
  XLYIII. 
  — 
  On 
  Certain 
  Double 
  Halogen 
  Salts 
  of 
  Ccesium 
  

   and 
  Rubidium 
  ; 
  by 
  H. 
  L. 
  Wells 
  and 
  H. 
  W. 
  Foote. 
  

  

  1. 
  The 
  Co7nplicated 
  Rubidium- 
  Antimony 
  Chloride. 
  

  

  Rehsen 
  and 
  Saunders- 
  have 
  described 
  a 
  salt 
  to 
  which 
  

   they 
  gave 
  the 
  formula 
  23RbCl 
  . 
  10SbC] 
  3 
  as 
  the 
  most 
  probable 
  

   one. 
  ^Wheeler, 
  f 
  working 
  in 
  this 
  laboratory, 
  confirmed 
  Remsen 
  

   and 
  Saunders' 
  results 
  and 
  discovered 
  besides 
  an 
  analogous 
  

   bromide, 
  to 
  which 
  the 
  probable 
  formula 
  23RbBr 
  . 
  10SbBr 
  3 
  was 
  

   given. 
  Remsen 
  and 
  Brigham;}; 
  prepared 
  the 
  salt 
  23RbCl 
  . 
  

   10BiCl 
  3 
  . 
  Herty§ 
  has 
  since 
  described 
  the 
  two 
  potassium 
  salts 
  

   23KC1.10SbCl 
  3 
  and 
  23KBr 
  . 
  lOSbBr, 
  . 
  2TH 
  2 
  0, 
  and 
  some 
  mix- 
  

   tures 
  of 
  these 
  two 
  salts. 
  

  

  In 
  view 
  of 
  all 
  this 
  work, 
  there 
  can 
  scarcely 
  be 
  a 
  doubt 
  as 
  to 
  

   the 
  existence 
  of 
  a 
  type 
  of 
  salts 
  with 
  a 
  somewhat 
  complicated 
  

   ratio, 
  but 
  in 
  view 
  of 
  the 
  fact 
  that 
  this 
  complicated 
  ratio 
  23 
  : 
  10 
  

   is 
  apparently 
  an 
  exception 
  to 
  the 
  simplicity 
  of 
  composition 
  of 
  

   all 
  other 
  carefully 
  investigated 
  double 
  halogen 
  salts, 
  the 
  sub- 
  

   ject 
  seemed 
  worthy 
  of 
  some 
  further 
  investigation. 
  For 
  the 
  

   purpose, 
  we 
  have 
  studied 
  only 
  the 
  rubidium-antimony 
  chloride 
  

   of 
  Remsen 
  and 
  Saunders, 
  as 
  this 
  salt 
  is 
  readily 
  prepared 
  and 
  

   is 
  capable 
  of 
  repeated 
  recrystallization 
  from 
  hydrochloric 
  acid 
  

   solution. 
  

  

  The 
  possibility 
  suggested 
  itself 
  that 
  the 
  product 
  might 
  con- 
  

   sist 
  of 
  two 
  simpler 
  salts 
  of 
  similar 
  or 
  identical 
  crystalline 
  form, 
  

   which 
  were 
  capable 
  of 
  crystallizing 
  together, 
  and 
  that 
  previous 
  

   investigators 
  had 
  made 
  use 
  of 
  conditions 
  which 
  resulted 
  in 
  

   obtaining 
  a 
  constant 
  mixture 
  of 
  two 
  such 
  salts. 
  Although 
  this 
  

   supposition 
  had 
  scarcely 
  any 
  probability 
  in 
  view 
  of 
  the 
  exist- 
  

   ence 
  also 
  of 
  the 
  rubidium-antimony 
  bromide 
  and 
  of 
  the 
  two 
  

   potassium 
  salts, 
  we 
  have 
  put 
  the 
  question 
  to 
  test 
  by 
  repeatedly 
  

   recrystallizing 
  the 
  salt, 
  using 
  not 
  only 
  ordinary 
  dilute 
  hydro- 
  

   chloric 
  acid 
  for 
  this 
  purpose, 
  but 
  also 
  more 
  dilute 
  and 
  much 
  

   more 
  concentrated 
  acid 
  and 
  also 
  an 
  alcoholic 
  hydrochloric 
  acid 
  

   solution. 
  As 
  will 
  be 
  seen 
  from 
  the 
  analyses, 
  given 
  beyond, 
  no 
  

   variation 
  in 
  composition 
  could 
  be 
  detected 
  by 
  the 
  use 
  of 
  these 
  

   widely 
  varying 
  solvents 
  for 
  recrystallization, 
  and 
  it 
  therefore 
  

   appears 
  impossible 
  that 
  the 
  salt 
  can 
  be 
  a 
  mixture. 
  

   , 
  As 
  a 
  starting 
  point, 
  we 
  used 
  a 
  solution 
  in 
  hydrochloric 
  acid 
  

   containing 
  the 
  constituents 
  RbCl 
  and 
  SbCl 
  3 
  in 
  the 
  exact 
  molecu- 
  

   lar 
  proportion 
  23 
  : 
  10. 
  Product 
  A 
  was 
  the 
  first, 
  B 
  the 
  third 
  

   and 
  C 
  the 
  fifth 
  recrystallization 
  from 
  pure 
  dilute 
  hydrochloric 
  

   acid. 
  The 
  product 
  D 
  was 
  obtained 
  by 
  adding 
  concentrated 
  

  

  * 
  Am. 
  Chem. 
  Jour., 
  xiv, 
  155. 
  f 
  This 
  Journal, 
  xlvi, 
  269. 
  

  

  \ 
  Am. 
  Chem. 
  Jour., 
  xiv, 
  174. 
  § 
  Am. 
  Chem. 
  Jour., 
  xvi, 
  490. 
  

  

  Am. 
  Jouk. 
  Sci.— 
  Fourth 
  Series, 
  Vol. 
  Ill, 
  Xo. 
  18— 
  June, 
  1897. 
  

   32 
  

  

  