﻿216 
  Gooch 
  and 
  Gruener 
  — 
  Method 
  for 
  the 
  Determination 
  

  

  In 
  all 
  these 
  experiments 
  hydriodic 
  acid 
  was 
  present 
  in 
  amount 
  

   equivalent 
  to 
  1*1 
  grm. 
  of 
  potassium 
  iodide 
  — 
  0*5 
  grm. 
  intro- 
  

   duced 
  as 
  iodine 
  and 
  0*6 
  grm. 
  introduced 
  as 
  such 
  in 
  the 
  stan- 
  

   dard 
  iodine 
  where 
  it 
  plays 
  the 
  part 
  of 
  solvent. 
  

  

  In 
  the 
  experiments 
  recorded 
  in 
  Table 
  II, 
  smaller 
  amounts 
  of 
  

   antimony 
  and 
  correspondingly 
  smaller 
  quantities 
  of 
  the 
  oxidiz- 
  

   ing 
  solution 
  were 
  employed 
  ; 
  otherwise, 
  the 
  same 
  general 
  mode 
  

   of 
  proceeding 
  was 
  followed. 
  The 
  limits 
  of 
  concentration 
  fixed 
  

   upon 
  were, 
  however, 
  varied 
  somewhat. 
  The 
  previous 
  experi- 
  

   ments 
  showed 
  plainly 
  that 
  anything 
  like 
  a 
  complete 
  reduction 
  

   of 
  the 
  antimony 
  could 
  not 
  be 
  anticipated 
  when 
  the 
  final 
  

   volume 
  was 
  greater 
  than 
  60 
  cm. 
  3 
  , 
  and 
  the 
  experience 
  with 
  the 
  

   smaller 
  amounts 
  of 
  antimony 
  treated 
  in 
  the 
  second 
  series 
  

   pointed 
  to 
  the 
  fact, 
  as 
  the 
  work 
  progressed, 
  that 
  for 
  them 
  the 
  

   crystallization 
  and 
  sublimation 
  did 
  not 
  occur 
  until 
  the 
  concen- 
  

   tration 
  had 
  brought 
  about 
  a 
  decrease 
  in 
  volume 
  to 
  35 
  cm\ 
  

   The 
  limits 
  of 
  final 
  volume 
  were 
  placed 
  therefore, 
  for 
  these 
  

   experiments, 
  at 
  60 
  cm. 
  3 
  and 
  35 
  cm 
  3 
  . 
  Centinormal 
  iodine 
  was 
  

   used 
  for 
  the 
  oxidations 
  and 
  bleaching 
  with 
  sulphurous 
  acid 
  

   was 
  found 
  to 
  be 
  unnecessary, 
  the 
  amount 
  of 
  iodine 
  liberated 
  in 
  

   these 
  experiments 
  being 
  so 
  small 
  as 
  to 
  vanish 
  in 
  the 
  concentra- 
  

   tion 
  so 
  completely 
  that 
  no 
  color 
  was 
  visible 
  (nor 
  was 
  it 
  brought 
  

   out 
  by 
  starch) 
  after 
  washing 
  down 
  the 
  trap 
  and 
  cooling. 
  There 
  

   did 
  remain 
  a 
  trace 
  of 
  color 
  before 
  the 
  addition 
  of 
  the 
  water 
  

   but 
  this 
  seemed 
  to 
  us 
  to 
  be 
  due 
  in 
  all 
  probability 
  to 
  the 
  incip- 
  

   ient 
  formation 
  of 
  the 
  antimonious 
  iodide 
  or 
  oxyiodide 
  which 
  

   is 
  decomposed 
  by 
  the 
  action 
  of 
  more 
  water. 
  At 
  all 
  events 
  it 
  

   disappeared 
  on 
  the 
  addition 
  of 
  water 
  and 
  no 
  reoxidation 
  of 
  the 
  

   antimony 
  was 
  found 
  subsequently. 
  

  

  Table 
  II. 
  

  

  Final 
  

   Volume. 
  

  

  Tartar 
  

   Emetic 
  

   taken. 
  

  

  Sb 
  2 
  3 
  

   taken. 
  

  

  Iodine 
  used 
  

  

  in 
  final 
  

   oxidation. 
  

  

  Sb 
  2 
  3 
  

   found. 
  

  

  grm. 
  

   0C136 
  

  

  Ex-ror. 
  

  

  cm 
  3 
  . 
  

   60 
  

  

  grm. 
  

   0-0500 
  

  

  grm. 
  

   0-0217 
  

  

  grm. 
  

   0-0239 
  

  

  grm. 
  

   00081- 
  

  

  60 
  

  

  0-0500 
  

  

  0-0217 
  

  

  0-0258 
  

  

  0-0147 
  

  

  0-0070- 
  

  

  60 
  

  

  00500 
  

  

  0-0217 
  

  

  0-0261 
  

  

  0-0148 
  

  

  0-0069 
  — 
  

  

  50 
  

  

  0-0500 
  

  

  0-0217 
  

  

  0-0316 
  

  

  0-0180 
  

  

  0-0037 
  — 
  

  

  f40 
  

   | 
  35 
  

  

  0-0500 
  

  

  0-0217 
  

  

  0-0385 
  

  

  0-0219 
  

  

  0-0002 
  + 
  

  

  '0-0500 
  

  

  0-0217 
  

  

  0-0380 
  

  

  0-0*216 
  

  

  o-oooi- 
  

  

  \ 
  35 
  

  

  0-0500 
  

  

  0-0217 
  

  

  0-0381 
  

  

  0-0217 
  

  

  o-oooo 
  

  

  | 
  35 
  

  

  0-0500 
  

  

  0-0217 
  

  

  0-0382 
  

  

  0-0218 
  

  

  0-0001 
  + 
  

  

  135 
  

  

  00500 
  

  

  0-0217 
  

  

  003S2 
  

  

  0-0218 
  

  

  0-0001 
  + 
  

  

  These 
  results 
  show 
  that 
  for 
  the 
  smaller 
  amounts 
  of 
  antimony 
  

   the 
  reduction 
  was 
  completed 
  only 
  by 
  pushing 
  the 
  degree 
  of 
  

   concentration 
  somewhat 
  lower 
  than 
  was 
  found 
  to 
  be 
  necessary 
  

  

  