﻿Salts 
  of 
  Caesium 
  and 
  Rubidium. 
  463 
  

  

  I. 
  

  

  II. 
  

  

  III. 
  

  

  IX. 
  

  

  Per 
  cent 
  Sb 
  found 
  25-37 
  

  

  25-42 
  

  

  25-43 
  

  

  25-44 
  

  

  " 
  " 
  calculated 
  25*13 
  

  

  

  

  

  

  

  

  Sb. 
  

  

  01. 
  

  

  23-89 
  

  

  37*00 
  

  

  23-64 
  

  

  37-00 
  

  

  23-86 
  

  

  37-22 
  

  

  23-66 
  

  

  37*16 
  

  

  The 
  atomic 
  weights 
  used 
  in 
  all 
  the 
  calculations 
  were 
  Rb 
  85-43 
  ; 
  

   Sb 
  120-43 
  ; 
  CI 
  35-45 
  ; 
  S 
  32-07 
  ; 
  Ag 
  107-92 
  ; 
  Cs 
  132-89. 
  

  

  Since 
  the 
  method 
  used 
  for 
  the 
  determination 
  of 
  antimony 
  

   gives 
  results 
  which 
  are 
  slightly 
  too 
  high, 
  we 
  believe 
  that 
  a 
  

   deduction 
  of 
  the 
  average 
  error 
  0*25 
  per 
  cent 
  from 
  the 
  anti- 
  

   mony 
  found 
  in 
  the 
  analyses 
  of 
  the 
  rubidium 
  salt 
  will 
  give 
  a 
  

   result 
  which 
  is 
  nearer 
  the 
  truth. 
  

  

  Rb. 
  

  

  Average 
  previously 
  giveu 
  39-19 
  

  

  Average 
  with 
  correction 
  forSb 
  39-19 
  

  

  Calculated 
  for 
  Rb 
  23 
  Sb 
  10 
  Cl 
  53 
  38"92 
  

  

  Calculated 
  for 
  Rb 
  7 
  Sb 
  3 
  Cl 
  16 
  39-18 
  

  

  It 
  may 
  be 
  noticed 
  that 
  the 
  results 
  agree 
  rather 
  more 
  satis- 
  

   factorily 
  with 
  the 
  formula 
  7RbCl 
  . 
  3SbCl 
  3 
  than 
  with 
  the 
  more 
  

   complicated 
  one 
  advanced 
  by 
  Remsen 
  and 
  Saunders. 
  The 
  

   differences 
  between 
  these 
  formulae 
  are, 
  however, 
  so 
  slight 
  that 
  

   it 
  is 
  probably 
  entirely 
  impossible 
  to 
  decide 
  between 
  them 
  by 
  

   means 
  of 
  chemical 
  analysis, 
  the 
  ratio 
  Rb 
  : 
  Sb 
  being 
  230 
  : 
  100 
  

   in 
  one 
  case, 
  and 
  in 
  the 
  other 
  233 
  : 
  100. 
  However, 
  since 
  it 
  is 
  

   customary 
  to 
  use 
  the 
  simplest 
  applicable 
  formula 
  for 
  a 
  chem- 
  

   ical 
  compound, 
  we 
  propose 
  the 
  formula 
  7RbCl 
  . 
  3SbCl 
  3 
  for 
  this 
  

   salt 
  and 
  corresponding 
  formulae 
  for 
  other 
  salts 
  of 
  this 
  series. 
  

   Herty's 
  hydrous 
  salt, 
  to 
  which 
  he 
  gave 
  the 
  formula 
  23KBr 
  . 
  

   lOSbBr, 
  . 
  27H 
  2 
  0, 
  agrees 
  well 
  with 
  the 
  formula 
  7KBr. 
  3SbBr, 
  

   8H 
  2 
  0. 
  It 
  must 
  be 
  admitted 
  that 
  the 
  7: 
  3 
  ratio 
  is 
  an 
  unusually 
  

   complicated 
  one, 
  but 
  it 
  is 
  far 
  simpler 
  than 
  23 
  : 
  10 
  and 
  is 
  scarcely 
  

   a 
  marked 
  exception 
  to 
  the 
  general 
  simplicity 
  of 
  double 
  halogen 
  

   salts. 
  

  

  2. 
  A 
  rubidium-antimony 
  oxy 
  chloride, 
  2Rb 
  CI 
  . 
  Sb 
  Cl 
  3 
  . 
  Sb 
  O 
  CI. 
  

  

  In 
  attempting 
  to 
  recrystallize 
  the 
  salt 
  7RbCl 
  . 
  3SbCl 
  3 
  from 
  

   very 
  dilute 
  hydrochloric 
  acid, 
  just 
  enough 
  to 
  prevent 
  the 
  

   formation 
  of 
  antimony 
  oxychloride, 
  this 
  new 
  salt 
  was 
  obtained 
  

   in 
  the 
  form 
  of 
  short 
  colorless 
  prisms 
  possessing 
  a 
  rather 
  high 
  

   luster. 
  It 
  can 
  be 
  recrystallized 
  from 
  very 
  dilute 
  hydrochloric 
  

   acid. 
  

  

  The 
  following 
  results 
  were 
  obtained 
  from 
  analyses 
  of 
  sepa- 
  

   rate 
  crops 
  : 
  

  

  Calculated 
  for 
  

   I. 
  II. 
  2RbCl 
  . 
  SbCl 
  3 
  . 
  SbOCl. 
  

  

  Rb 
  26-54 
  26-68 
  26'68 
  

  

  Sb 
  37-58 
  37*36 
  37*61 
  

  

  CI 
  __ 
  _ 
  32-75 
  32-80 
  33-21 
  

  

  O 
  (by 
  diff.) 
  3-13 
  3'16 
  2-50 
  

  

  