﻿Chemistry 
  and 
  Physics. 
  329 
  

  

  3. 
  On 
  the 
  Determination 
  of 
  Molybdenum 
  by 
  Potassium 
  

   Iodate. 
  — 
  George 
  S. 
  Jamieson 
  of 
  the 
  Sheffield 
  Scientific 
  School 
  

   has 
  applied 
  the 
  general 
  method 
  of 
  titration 
  of 
  L. 
  W. 
  Andrews 
  

   to 
  the 
  determination 
  of 
  molybdenum. 
  He 
  recommends 
  that 
  the 
  

   solution 
  of 
  a 
  molybdate 
  strongly 
  acidified 
  with 
  hydrochloric 
  

   acid, 
  and 
  heated 
  to 
  about 
  50° 
  C, 
  should 
  be 
  passed 
  slowly 
  through 
  

   a 
  rather 
  long 
  and 
  warm 
  " 
  Jones 
  reductor 
  " 
  of 
  granulated 
  and 
  amal- 
  

   gamated 
  zinc, 
  the 
  outlet 
  of 
  which 
  leads 
  to 
  the 
  bottom 
  of 
  a 
  glass- 
  

   stoppered 
  bottle 
  placed 
  in 
  cold 
  water 
  and 
  containing 
  iodine 
  mono- 
  

   chloride 
  in 
  hydrochloric 
  acid, 
  as 
  well 
  as 
  a 
  little 
  chloroform 
  for 
  

   use 
  as 
  an 
  indicator. 
  Under 
  these 
  conditions 
  the 
  molybdic 
  acid 
  is 
  

   reduced 
  to 
  Mo 
  2 
  3 
  in 
  the 
  reductor 
  and 
  is 
  readily 
  oxidized 
  to 
  Mo 
  2 
  5 
  

   by 
  the 
  iodine 
  monochloride 
  with 
  the 
  liberation 
  of 
  iodine. 
  The 
  

   liquid 
  is 
  then 
  titrated, 
  in 
  the 
  presence 
  of 
  at 
  least 
  10 
  per 
  cent 
  of 
  

   actual 
  hydrochloric 
  acid, 
  with 
  a 
  standard 
  solution 
  of 
  potassium 
  

   iodate 
  until 
  the 
  chloroform 
  loses 
  its 
  color. 
  A 
  good 
  end-reaction 
  

   was 
  obtained 
  at 
  this 
  point, 
  but 
  it 
  was 
  observed 
  that 
  the 
  oxidation 
  

   goes 
  further 
  to 
  Mo0 
  3 
  in 
  the 
  course 
  of 
  about 
  2 
  days. 
  The 
  test 
  

   analyses 
  show 
  good 
  results, 
  but 
  they 
  all 
  deal 
  with 
  small 
  quantities 
  

   of 
  molybdenum, 
  the 
  largest 
  of 
  which 
  is 
  0*0627 
  g. 
  It 
  would 
  be 
  

   interesting 
  to 
  know 
  if 
  the 
  process 
  can 
  be 
  easily 
  applied 
  to 
  the 
  

   ammonium 
  phosphomolybdate 
  precipitate. 
  — 
  Jour. 
  Amer. 
  Chem. 
  

   Soc, 
  xxxix, 
  246. 
  h. 
  l. 
  w. 
  

  

  4. 
  The 
  Fixation 
  of 
  Nitrogen. 
  — 
  John 
  E. 
  Bitcher 
  has 
  made 
  the 
  

   observation 
  that 
  a 
  process 
  depending 
  upon 
  the 
  formation 
  of 
  

   potassium 
  cyanide 
  by 
  the 
  action 
  of 
  atmospheric 
  nitrogen 
  upon 
  a 
  

   heated 
  mixture 
  of 
  carbon, 
  potassium 
  carbonate 
  and 
  finely 
  divided 
  

   metallic 
  iron, 
  described 
  as 
  long 
  ago 
  as 
  1839 
  by 
  Lewis 
  Thompson, 
  

   is 
  the 
  basis 
  of 
  a 
  practically 
  important 
  method 
  for 
  the 
  fixation 
  of 
  

   nitrogen. 
  It 
  appears 
  that 
  numerous 
  attempts 
  to 
  utilize 
  the 
  

   method 
  or 
  to 
  confirm 
  its 
  application 
  in 
  those 
  early 
  times 
  failed 
  to 
  

   be 
  successful 
  on 
  account 
  of 
  omitting 
  the 
  use 
  of 
  the 
  finely 
  divided 
  

   iron 
  which 
  acts 
  as 
  a 
  catalyzer 
  and 
  is 
  of 
  the 
  greatest 
  importance. 
  

  

  The 
  author 
  has 
  found 
  that 
  at 
  moderate 
  temperatures 
  of 
  920° 
  C, 
  

   or 
  lower 
  it 
  is 
  possible 
  to 
  obtain 
  large 
  yields 
  of 
  sodium 
  cyanide 
  

   from 
  mixtures 
  of 
  sodium 
  carbonate, 
  carbon 
  and 
  finely 
  divided 
  

   iron 
  upon 
  passing 
  nitrogen 
  gas. 
  It 
  is 
  even 
  possible 
  to 
  start 
  with 
  

   oxide 
  of 
  iron 
  in 
  the 
  place 
  of 
  the 
  metal 
  and 
  to 
  use 
  producer 
  gas 
  

   under 
  proper 
  conditions 
  in 
  place 
  of 
  pure 
  atmospheric 
  nitrogen. 
  

   The 
  author's 
  description 
  of 
  his 
  many 
  experiments 
  with 
  their 
  

   results 
  leads 
  to 
  the 
  opinion 
  that 
  the 
  process 
  is 
  a 
  promising 
  one 
  

   for 
  commercial 
  application. 
  An 
  interesting 
  experiment 
  was 
  the 
  

   distillation 
  Of 
  the 
  sodium 
  cyanide 
  from 
  the 
  mass 
  in 
  which 
  it 
  was 
  

   formed 
  by 
  heating 
  in 
  vacuo. 
  — 
  Jour. 
  Indust. 
  and 
  Eng. 
  Chem., 
  

   ix, 
  233. 
  h. 
  l. 
  w. 
  

  

  5. 
  The 
  Volatilization 
  of 
  Potash 
  from 
  Cement 
  Materials. 
  — 
  In 
  

   connection 
  with 
  the 
  possibility 
  of 
  volatilizing 
  potash 
  from 
  

   silicates 
  during 
  the 
  process 
  of 
  manufacturing 
  Portland 
  cement 
  

   and 
  the 
  collection 
  of 
  the 
  volatilized 
  material 
  by 
  means 
  of 
  the 
  

   electrical 
  precipitation 
  of 
  the 
  dust 
  from 
  the 
  furnace 
  gases, 
  E. 
  

  

  