﻿S. 
  B. 
  Ktizirian 
  — 
  Action 
  of 
  Sodium 
  Paratung 
  state. 
  301 
  

  

  Art. 
  XXX. 
  — 
  The 
  Action 
  of 
  Sodium 
  Paratungstate 
  in 
  Fus- 
  

   ion 
  on 
  Salts 
  of 
  the 
  Halogen 
  Acids 
  and 
  Oxy 
  -halogen 
  Acids 
  ; 
  

   by 
  S. 
  B. 
  Kuzirian. 
  

  

  [Contributions 
  from 
  the 
  Kent 
  Chemical 
  Laboratory 
  of 
  Yale 
  Univ. 
  — 
  ccxlvii.] 
  

  

  The 
  use 
  of 
  sodium 
  paratungstate 
  as 
  a 
  flux 
  in 
  the 
  expulsion 
  

   of 
  carbon 
  dioxide 
  from 
  carbonates 
  and 
  nitrogen 
  pentoxide 
  

   from 
  nitrates 
  has 
  been 
  proved 
  to 
  be 
  sharp 
  and 
  complete.* 
  It 
  

   is 
  likewise 
  of 
  interest 
  to 
  note 
  the 
  action 
  of 
  this 
  flux 
  on 
  other 
  

   common 
  salts 
  that 
  have 
  a 
  volatile 
  acid 
  radical. 
  

  

  Salts 
  of 
  the 
  Halogen 
  Acids. 
  

  

  Sodium 
  Fluoride 
  and 
  Silicofluoride. 
  — 
  When 
  a 
  mixture 
  of 
  

   0*2 
  grm. 
  of 
  sodium 
  fluoride 
  with 
  3 
  grm. 
  of 
  sodium 
  paratung- 
  

   state 
  is 
  fused 
  a 
  partial 
  elimination 
  of 
  chlorine 
  takes 
  place 
  slowly. 
  

   In 
  one 
  experiment 
  the 
  loss 
  of 
  fluorine 
  after 
  ten 
  minutes' 
  fusion 
  

   amounted 
  to 
  about 
  fifty 
  per 
  cent 
  of 
  that 
  originally 
  present 
  in 
  

   the 
  fluoride. 
  

  

  On 
  application 
  of 
  heat 
  to 
  a 
  mixture 
  of 
  sodium 
  silicofluo- 
  

   ride 
  and 
  sodium 
  paratungstate, 
  gaseous 
  silicon 
  tetrachloride 
  is 
  

   evolved, 
  but 
  this 
  is 
  immediately 
  attacked 
  by 
  the 
  atmospheric 
  

   oxygen 
  and 
  water 
  vapor 
  from 
  the 
  source 
  of 
  heat 
  and 
  a 
  white 
  

   deposit 
  of 
  silica, 
  which 
  does 
  not 
  disappear 
  on 
  further 
  ignition, 
  

   is 
  formed 
  on 
  the 
  edges 
  of 
  platinum 
  crucible. 
  

  

  Sodium 
  Chloride. 
  — 
  The 
  reaction 
  between 
  sodium 
  chloride 
  

   and 
  sodium 
  paratungstate 
  is 
  likewise 
  slow 
  and 
  incomplete. 
  

   For 
  example, 
  in 
  one 
  experiment 
  it 
  was 
  found 
  that 
  a 
  twenty- 
  

   minutes' 
  fusion 
  of 
  a 
  mixture 
  of 
  3 
  grm. 
  of 
  sodium 
  paratungstate 
  

   and 
  0*3 
  grm. 
  of 
  sodium 
  chloride 
  effected 
  the 
  decomposition 
  of 
  

   the 
  chloride 
  to 
  an 
  amount 
  of 
  only 
  forty-six 
  per 
  cent, 
  and 
  on 
  

   further 
  heating, 
  the 
  reaction 
  proceeded 
  even 
  more 
  slowly 
  and 
  

   could 
  not 
  be 
  brought 
  to 
  completion 
  with 
  accuracy. 
  

  

  Sodium 
  Bromide. 
  — 
  From 
  the 
  fact 
  that 
  the 
  same 
  conditions 
  

   prevail 
  in 
  the 
  fusion 
  of 
  bromides 
  with 
  paratungstate 
  as 
  in 
  the 
  

   case 
  of 
  chlorides, 
  it 
  is 
  natural 
  to 
  expect 
  that 
  only 
  partial 
  decom- 
  

   position 
  will 
  take 
  place 
  ; 
  and 
  that 
  is 
  due, 
  similarly, 
  to 
  the 
  slow 
  

   atmospheric 
  action 
  upon 
  the 
  fused 
  mass. 
  In 
  ten 
  minutes' 
  

   fusion 
  of 
  a 
  mixture 
  of 
  3 
  grm. 
  of 
  sodium 
  paratungstate 
  and 
  0'3 
  

   grm. 
  of 
  sodium 
  bromide, 
  about 
  sixty 
  per 
  cent 
  of 
  the 
  bromide 
  

   was 
  decomposed, 
  as 
  against 
  a 
  forty-six 
  per 
  cent 
  loss 
  in 
  twenty 
  

   minutes' 
  ignition 
  in 
  the 
  case 
  of 
  sodium 
  chloride. 
  After 
  this 
  

   period 
  the 
  reaction 
  began 
  to 
  proceed 
  much 
  more 
  slowly. 
  

  

  Potassium 
  Iodide. 
  — 
  The 
  action 
  of 
  sodium 
  paratungstate 
  

   upon 
  iodides 
  is 
  somewhat 
  different 
  from 
  that 
  upon 
  the 
  rest 
  of 
  

   * 
  This 
  Journal 
  [4], 
  xxxi, 
  497. 
  

  

  