﻿G. 
  S. 
  Jamieson 
  — 
  Double 
  Salts 
  of 
  Caesium 
  Chloride. 
  67 
  

  

  Art. 
  VII. 
  — 
  On 
  the 
  Double 
  Salts 
  of 
  Caesium 
  Chloride 
  with 
  

   Calcium 
  and 
  Strontium 
  Chlorides 
  / 
  by 
  George 
  S. 
  Jamie- 
  

   son. 
  

  

  [Contribution 
  from 
  the 
  Sheffield 
  Chemical 
  Laboratory 
  of 
  Yale 
  University.] 
  

  

  The 
  object 
  of 
  this 
  work 
  was 
  to 
  investigate 
  the 
  double 
  salts 
  

   of 
  caesium 
  chloride 
  in 
  combination 
  with 
  the 
  alkali 
  earths 
  metals. 
  

   It 
  should 
  be 
  observed 
  that 
  no 
  barium 
  double 
  salt 
  was 
  obtained, 
  

   but 
  this 
  was 
  not 
  surprising 
  since 
  barium 
  generally 
  shows 
  little 
  

   tendency 
  to 
  form 
  double 
  salts. 
  Many 
  attempts 
  were 
  made 
  to 
  

   obtain 
  double 
  caesium 
  alkali 
  earth 
  bromides, 
  but 
  without 
  suc- 
  

   cess. 
  

  

  The 
  double 
  salts 
  to 
  be 
  described 
  are 
  as 
  follows 
  : 
  

  

  2CsCl.CaCl 
  2 
  .2H 
  2 
  

   5CsC1.2SrCl 
  3 
  .8H 
  a 
  O. 
  

  

  Caesium- 
  Calcium 
  Chloride. 
  — 
  This 
  salt 
  was 
  obtained 
  readily 
  

   from 
  concentrations 
  of 
  1-4 
  molecules 
  of 
  caesium 
  chloride 
  to 
  

   1-4 
  molecules 
  of 
  calcium 
  chloride. 
  

  

  80 
  grams 
  of 
  caesium 
  chloride 
  and 
  40 
  grams 
  of 
  anhydrous 
  

   calcium 
  chloride 
  were 
  dissolved 
  in 
  100 
  cc 
  of 
  hot 
  water. 
  Dur- 
  

   ing 
  the 
  night 
  a 
  crop 
  of 
  colorless 
  slender 
  prisms 
  separated. 
  

   The 
  crystals 
  were 
  filtered 
  by 
  suction, 
  pressed 
  thoroughly 
  on 
  

   filter 
  paper, 
  and 
  allowed 
  to 
  stand 
  in 
  a 
  desiccator 
  over 
  calcium 
  

   chloride 
  for 
  about 
  4 
  hours 
  before 
  making 
  the 
  analysis. 
  This 
  

   double 
  salt 
  was 
  found 
  to 
  be 
  very 
  soluble 
  in 
  water. 
  After 
  the 
  

   removal 
  of 
  the 
  first 
  crop 
  of 
  crystals, 
  40 
  grams 
  more 
  of 
  anhy- 
  

   drous 
  calcium 
  chloride, 
  previously 
  dissolved 
  in 
  50 
  cc 
  of 
  water, 
  

   were 
  added 
  to 
  the 
  solution. 
  A 
  second 
  crop 
  of 
  the 
  double 
  salt 
  

   was 
  obtained. 
  Some 
  of 
  these 
  crystals 
  were 
  2"5 
  cm 
  long. 
  An- 
  

   other 
  40 
  grams 
  of 
  calcium 
  chloride 
  in 
  50 
  cc 
  of 
  water 
  were 
  added 
  

   to 
  the 
  solution 
  and 
  a 
  third 
  crop 
  of 
  the 
  double 
  salt 
  was 
  obtained. 
  

   The 
  three 
  preparations 
  gave 
  the 
  following 
  results 
  by 
  analysis 
  : 
  

  

  Calculated 
  for 
  Found 
  

  

  2CsCl.CaCl 
  2 
  .2H 
  2 
  12 
  3 
  

  

  H 
  a 
  O 
  7-44^ 
  

  

  CI 
  29-34 
  

  

  Ca 
  _. 
  8-26 
  8-43 
  8'46 
  8'60 
  

  

  Cs 
  ___ 
  54-96 
  

  

  Caesium-Strontium 
  Chloride. 
  — 
  A 
  solution 
  containing 
  2 
  mole- 
  

   cules 
  of 
  caesium 
  chloride 
  to 
  1 
  of 
  strontium 
  chloride 
  yielded 
  the 
  

   double 
  salt. 
  When 
  the 
  concentration 
  was 
  one 
  molecule 
  of 
  cae- 
  

   sium 
  chloride 
  to 
  one 
  of 
  strontium 
  chloride, 
  only 
  strontium 
  

   chloride 
  crystallized, 
  and 
  when 
  the 
  concentration 
  of 
  the 
  solution 
  

  

  