﻿310 
  S. 
  B. 
  Kuzirian 
  — 
  Use 
  of 
  the 
  Sodium 
  Paratung 
  state. 
  

  

  melting 
  points 
  of 
  potassium 
  perchlorate 
  and 
  sodium 
  para- 
  

   tungstate 
  are 
  rather 
  near 
  to 
  each 
  other. 
  First 
  the 
  perchlor- 
  

   ate 
  melts, 
  and 
  then 
  the 
  paratungstate 
  begins 
  to 
  fuse, 
  with 
  

   rather 
  a 
  violent 
  interaction, 
  so 
  excessive 
  care 
  is 
  necessary 
  to 
  

   avoid 
  mechanical 
  loss 
  at 
  this 
  point.* 
  After 
  the 
  violent 
  action 
  

   ceases 
  then 
  the 
  cover 
  of 
  the 
  platinum 
  crucible 
  is 
  taken 
  off, 
  and 
  

   the 
  usual 
  blast 
  ignition 
  started. 
  

  

  The 
  potassium 
  perchlorate 
  used 
  in 
  the 
  analysis 
  was 
  the 
  C. 
  P. 
  

   material 
  of 
  Commerce 
  containing 
  1*8 
  per 
  cent 
  potassium 
  chlor- 
  

   ate 
  as 
  impurity. 
  Results 
  obtained- 
  with 
  this 
  potassium 
  per- 
  

   chlorate 
  are 
  shown 
  in 
  Table 
  Y. 
  

  

  Table 
  V. 
  

  

  Analysis 
  of 
  Potassium 
  Perchlorate 
  of 
  Commerce, 
  after 
  Drying 
  in 
  the 
  Air 
  Bath. 
  

  

  KC10 
  4 
  Na 
  10 
  W 
  12 
  O 
  4 
  i 
  Loss 
  on 
  Theory 
  

  

  taken 
  taken 
  ignition 
  for 
  loss 
  Error 
  

  

  No. 
  grm. 
  grm. 
  grm. 
  grm. 
  grm. 
  

  

  1 
  0-3055 
  3 
  0-1996 
  0*2000 
  —0*0004 
  

  

  2 
  0-3055 
  3 
  0-2004 
  0'2000 
  -fO'0004 
  

  

  3 
  0-3055 
  3 
  0-2015 
  0*2000 
  +0*0015 
  

  

  4 
  0*3055 
  3 
  0*2006 
  0*2000 
  +0*0006 
  

  

  5 
  0-3055 
  3 
  0-2015 
  0'2000 
  +0'0015 
  

  

  6 
  0-3055 
  3 
  0-2000 
  0'2000 
  0-0000 
  

  

  After 
  bringing 
  the 
  mixture 
  of 
  perchlorate 
  and 
  paratungstate 
  

   to 
  quiet 
  fusion 
  with 
  a 
  gentle 
  name 
  of 
  the 
  Bunsen 
  burner 
  

   waved 
  underneath 
  the 
  platinum 
  crucible, 
  from 
  three 
  to 
  five 
  

   minutes' 
  blast 
  ignition 
  sufficed 
  to 
  obtain 
  the 
  results 
  in 
  the 
  table. 
  

   The 
  reason 
  for 
  choosing 
  a 
  rather 
  odd 
  amount 
  of 
  perchlorate 
  

   for 
  analysis 
  was 
  because 
  it 
  contained 
  1*8 
  per 
  cent 
  potassium 
  

   chloride 
  and 
  the 
  amount 
  taken 
  in 
  each 
  determination 
  corre- 
  

   sponds 
  exactly 
  to 
  0*3000 
  grm. 
  of 
  the 
  perchlorate. 
  Analysis 
  of 
  

   hypo 
  salts 
  of 
  halogens 
  was 
  not 
  attempted 
  because 
  of 
  their 
  

   indefinite 
  composition 
  and 
  the 
  difficulties 
  with 
  which 
  they 
  can 
  

   be 
  isolated. 
  

  

  Fluorides. 
  

  

  The 
  observation 
  that 
  the 
  tendency 
  of 
  the 
  halogen 
  salts 
  to 
  

   decompose 
  when 
  heated 
  in 
  the 
  atmosphere 
  increases 
  as 
  the 
  

   atomic 
  weight 
  of 
  the 
  halogen 
  rises, 
  does 
  not 
  hold 
  in 
  the 
  case 
  

   of 
  fluorine. 
  The 
  atomic 
  weight 
  of 
  fluorine, 
  being 
  the 
  lowest 
  

   among 
  the 
  halogen 
  atomic 
  weights, 
  it 
  would 
  be 
  expected 
  that 
  

   this 
  element 
  would 
  show 
  the 
  lowest 
  tendency 
  to 
  decompose 
  ; 
  

   but 
  in 
  this 
  respect 
  it 
  ranks 
  almost 
  with 
  bromine, 
  and 
  is 
  much 
  

   above 
  chlorine. 
  But 
  this 
  may 
  be 
  due 
  to 
  the 
  greater 
  hygro- 
  

  

  * 
  Precautions 
  to 
  be 
  observed 
  under 
  such 
  conditions 
  have 
  been 
  described 
  in 
  

   connection 
  with 
  the 
  chlorates 
  and 
  bromates. 
  

  

  