﻿RuVidium, 
  Sodium 
  and 
  Lithium 
  with 
  Thallium. 
  399 
  

  

  cold 
  water 
  but 
  gives 
  another 
  salt, 
  Rb 
  2 
  TlCl 
  5 
  . 
  H 
  2 
  upon 
  crystal- 
  

   lization. 
  Both 
  salts 
  are 
  white 
  as 
  are 
  all 
  the 
  chlorides 
  with 
  one 
  

   exception. 
  Two 
  separate 
  crops 
  of 
  each 
  were 
  analyzed 
  with 
  the 
  

   following 
  results 
  : 
  

  

  B. 
  Calculated 
  for 
  

  

  A. 
  i. 
  ii. 
  Cs 
  3 
  TlCl 
  6 
  H 
  2 
  0. 
  

  

  Cresium 
  _ 
  48-44 
  48-05 
  48*33 
  47*84 
  

  

  Thallium 
  24*21 
  24*45 
  24*37 
  24*46 
  

  

  Chlorine 
  25*37 
  25*53 
  25.54 
  

  

  Water 
  .... 
  2*74 
  1*97 
  2*16 
  

  

  Calculated 
  for 
  

   A. 
  B. 
  Rb 
  3 
  TlCl 
  6 
  H 
  2 
  0. 
  

  

  Rubidium 
  36'54 
  37*09 
  

  

  Thallium 
  29*02 
  29'65 
  29*50 
  

  

  Chlorine 
  30*99 
  31*17 
  30*81 
  

  

  Water 
  2*51 
  1*72 
  260 
  

  

  The 
  caesium 
  salt 
  was 
  obtained 
  in 
  hair-like 
  crystals, 
  too 
  small 
  

   for 
  measurement. 
  The 
  rubidium 
  salt 
  crystallized 
  in 
  thin 
  plates 
  

   having 
  a 
  rhombic 
  outline. 
  Under 
  the 
  microscope 
  these 
  showed 
  

   an 
  extinction 
  parallel 
  to 
  the 
  diagonals 
  and 
  in 
  convergent 
  light 
  

   a 
  bisectrix 
  at 
  one 
  side 
  of 
  the 
  field, 
  with 
  the 
  plane 
  of 
  the 
  optic 
  

   axes 
  at 
  right 
  angles 
  to 
  the 
  longer 
  diagonal, 
  indicating 
  mono- 
  

   clinic 
  symmetry. 
  

  

  2 
  : 
  1 
  Ccesium 
  and 
  Rubidium 
  Thallic 
  Chlorides, 
  Cs^TlCl^ 
  

   Os,TlOl 
  5 
  .R 
  r 
  2 
  and 
  Rb 
  2 
  TlC\. 
  11,0.— 
  The 
  anhydrous 
  caesium 
  

   salt 
  is 
  formed 
  when 
  5 
  to 
  8 
  g. 
  of 
  thallic 
  chloride 
  are 
  added 
  to 
  a 
  

   somewhat 
  concentrated 
  solution 
  of 
  100 
  g. 
  of 
  caesium 
  chloride, 
  

   and 
  the 
  hydrous 
  salt, 
  when 
  8 
  to 
  15 
  g. 
  of 
  thallic 
  chloride 
  are 
  

   added 
  to 
  a 
  more 
  dilute 
  solution 
  of 
  100 
  g. 
  of 
  caesium 
  chloride. 
  

   The 
  rubidium 
  salt 
  was 
  observed 
  when 
  1*25 
  to 
  18 
  g. 
  of 
  rubidium 
  

   chloride 
  were 
  added 
  to 
  a 
  rather 
  concentrated 
  solution 
  of 
  30 
  g. 
  

   of 
  thallic 
  chloride. 
  The 
  two 
  hydrous 
  salts 
  are 
  white 
  and 
  the 
  

   anhydrous 
  compound 
  is 
  pale 
  green. 
  The 
  caesium 
  salts 
  are 
  

   readily 
  soluble 
  in 
  hot 
  water 
  but 
  the 
  salt 
  Cs 
  3 
  Tl 
  2 
  Cl 
  9 
  crystallizes 
  

   from 
  the 
  solution. 
  The 
  rubidium 
  salt 
  recrystallizes 
  unchanged 
  

   from 
  water. 
  The 
  following 
  analyses 
  were 
  made 
  upon 
  separate 
  

   crops. 
  

  

  B. 
  Calculated 
  for 
  

  

  A. 
  i. 
  ii. 
  Cs 
  2 
  TlCl 
  5 
  . 
  

  

  Caesium 
  40*46 
  40*17 
  41*07 
  

  

  Thallium 
  31*11 
  31*82 
  31*62 
  31*52 
  

  

  Chlorine 
  27*19 
  27*30 
  27*20 
  27*41 
  

  

  Water 
  ...; 
  *81 
  -81 
  

  

  The 
  small 
  amount 
  of 
  water 
  found 
  in 
  the 
  above 
  analyses, 
  equiva- 
  

   lent 
  to 
  about 
  one-fourth 
  of 
  a 
  molecule, 
  was 
  probably 
  held 
  

   mechanically 
  by 
  the 
  crystals. 
  

  

  