﻿468 
  Wells 
  and 
  Foote 
  — 
  Do 
  r 
  able 
  Fluorides 
  of 
  

  

  then 
  removed 
  and 
  pressed 
  between 
  filter 
  papers 
  till 
  dry. 
  In 
  

   all 
  cases, 
  they 
  were 
  stable 
  in 
  the 
  air. 
  

  

  Method 
  of 
  analysis. 
  — 
  Zirconium 
  and 
  the 
  alkalies 
  were 
  

   determined 
  by 
  evaporating 
  the 
  salt 
  with 
  sulphuric 
  acid 
  to 
  

   drive 
  off 
  hydrofluoric 
  acid, 
  precipitating 
  zirconium 
  hydroxide 
  

   with 
  ammonia 
  and 
  weighing 
  Zr0 
  2 
  . 
  The 
  filtrate 
  was 
  evapo- 
  

   rated 
  to 
  dryness 
  and 
  the 
  alkali 
  determined 
  as 
  sulphate, 
  either 
  

   by 
  igniting 
  with 
  ammonium 
  carbonate 
  or 
  heating 
  in 
  a 
  current 
  

   of 
  air 
  containing 
  ammonia. 
  When 
  thallium 
  was 
  present, 
  the 
  

   fluoride 
  was 
  dissolved 
  in 
  water, 
  a 
  little 
  sulphurous 
  acid 
  added 
  

   to 
  make 
  sure 
  that 
  the 
  thallium 
  was 
  all 
  in 
  the 
  univalent 
  condi- 
  

   tion, 
  and 
  the 
  zirconium 
  precipitated 
  with 
  ammonia. 
  The 
  pre- 
  

   cipitate 
  needed 
  to 
  be 
  very 
  thoroughly 
  washed. 
  The 
  filtrate 
  

   was 
  evaporated 
  nearly 
  or 
  quite 
  to 
  dryness 
  to 
  remove 
  free 
  

   ammonia, 
  diluted 
  to 
  a 
  volume 
  of 
  about 
  100 
  cc 
  , 
  heated 
  to 
  boiling 
  

   and 
  potassium 
  iodide 
  added 
  in 
  excess 
  to 
  precipitate 
  thallium 
  

   iodide. 
  This 
  was 
  collected 
  on 
  a 
  Gooch 
  crucible, 
  washed 
  with 
  

   eighty 
  per 
  cent 
  alcohol, 
  dried 
  at 
  100° 
  C. 
  and 
  weighed. 
  Fluo- 
  

   rine 
  was 
  determined 
  by 
  the 
  ordinary 
  calcium 
  fluoride 
  method 
  

   after 
  precipitating 
  zirconium 
  with 
  ammonia 
  and 
  removing 
  

   ammonium 
  salts 
  by 
  evaporation 
  with 
  sodium 
  carbonate. 
  Water 
  

   was 
  determined 
  by 
  heating 
  the 
  salt 
  in 
  a 
  combustion 
  tube 
  

   behind 
  a 
  layer 
  of 
  dry 
  sodium 
  carbonate 
  and 
  collecting 
  the 
  

   water 
  in 
  a 
  calcium 
  chloride 
  tube. 
  

  

  Salts 
  of 
  Lithium. 
  

  

  2LiF.ZrF,.— 
  This 
  salt 
  forms 
  when 
  from 
  07 
  g 
  to 
  2 
  s 
  of 
  

   lithium 
  fluoride 
  are 
  added 
  to 
  20 
  g 
  of 
  zirconium 
  fluoride. 
  The 
  

   crystals 
  are 
  hexagonal, 
  showing 
  prism 
  and 
  pyramid 
  and 
  rarely 
  

   a 
  basal 
  plane. 
  In 
  appearance, 
  they 
  are 
  very 
  much 
  like 
  crystals 
  

   of 
  quartz 
  from 
  Herkimer 
  Co., 
  N". 
  Y., 
  but 
  they 
  are 
  very 
  small. 
  

   On 
  recrystallizing, 
  the 
  4 
  : 
  1 
  salt 
  was 
  formed. 
  

  

  Separate 
  crops 
  were 
  analyzed 
  with 
  the 
  following 
  results 
  : 
  

  

  Calculated 
  

   I. 
  II. 
  for 
  Li 
  2 
  ZrF 
  e 
  . 
  

  

  Li 
  603 
  6-39 
  6*42 
  

  

  Zr 
  41-81 
  41-64 
  41'28 
  

  

  F 
  __. 
  51-62 
  52-30 
  

  

  l^LiF 
  .ZrF^.%Hft. 
  — 
  This 
  was 
  the 
  most 
  unsatisfactory 
  salt 
  

   obtained, 
  though 
  it 
  seems 
  undoubtedly 
  to 
  establish 
  the 
  4 
  : 
  1 
  

   type. 
  As 
  lithium 
  fluoride 
  is 
  very 
  insoluble, 
  only 
  a 
  compara- 
  

   tively 
  small 
  amount 
  could 
  be 
  dissolved 
  in 
  zirconium 
  fluoride 
  

   and 
  apparently 
  we 
  could 
  not 
  go 
  far 
  enough 
  toward 
  the 
  lithium 
  

   end 
  to 
  get 
  the 
  salt 
  in 
  pure 
  condition. 
  It 
  formed 
  in 
  a 
  crust 
  

   ordinarily 
  and 
  the 
  crystals 
  were 
  very 
  small. 
  Under 
  the 
  micro- 
  

   scope, 
  no 
  mixture 
  with 
  another 
  salt 
  could 
  be 
  found 
  in 
  the 
  

  

  