﻿310 
  

  

  Gooch 
  and 
  Damie? 
  7 
  — 
  Method 
  for 
  the 
  

  

  volume 
  after 
  concentration 
  was 
  a 
  little 
  more, 
  and 
  the 
  antimony 
  

   was 
  in 
  every 
  case 
  oxidized 
  in 
  alkaline 
  solution 
  by 
  standard 
  

   iodine 
  previous 
  to 
  the 
  introduction 
  of 
  hydrochloric 
  acid 
  and 
  

   distillation. 
  

  

  Table 
  III 
  includes 
  the 
  records 
  of 
  experiments 
  similar 
  in 
  

   every 
  respect 
  to 
  those 
  of 
  Table 
  II 
  excepting 
  that 
  as 
  starch 
  

   showed 
  a 
  slight 
  color 
  in 
  the 
  cooled 
  liquid 
  after 
  distillation, 
  the 
  

   solution 
  was 
  treated 
  with 
  an 
  excess 
  of 
  sulphurous 
  acid 
  which 
  

   was 
  subsequently 
  oxidized 
  exactly 
  by 
  standard 
  iodine 
  previous 
  

   to 
  neutralization 
  and 
  the 
  h'nal 
  titration. 
  

  

  H 
  2 
  KAs0 
  4 
  

   taken. 
  

  

  grm. 
  

   0-5 
  

   0-5 
  

  

  KI 
  

  

  taken, 
  

  

  grin. 
  

   1-0 
  

   1-0 
  

  

  Volume 
  

   initial, 
  final. 
  

  

  cm. 
  15 
  

   100 
  

   100 
  

  

  cm.* 
  5 
  

   30 
  

   30 
  

  

  Color 
  | 
  Sb 
  2 
  3 
  ' 
  Sb 
  a 
  O 
  a 
  

  

  on 
  cooling, 
  with 
  starch. 
  j 
  taken, 
  found. 
  

  

  lie 
  yellow 
  

   none 
  

  

  Error. 
  

  

  none 
  

   none 
  

  

  grm. 
  grrn. 
  ] 
  grm. 
  

   02282 
  0-227l| 
  0-0011- 
  

   2283 
  2266 
  0-0017- 
  

  

  

  

  

  

  II. 
  

  

  

  

  0-5 
  

  

  0-5 
  

  

  120 
  

  

  50 
  

  

  none 
  

  

  none 
  

  

  0-2258 
  0-2235 
  0-0023- 
  

  

  0-5 
  

  

  0-5 
  

  

  100 
  

  

  50 
  

  

  pale 
  yellow 
  

  

  none 
  

  

  0-2252 
  0-2235 
  0-0017 
  — 
  

  

  0-5 
  

  

  0-5 
  

  

  100 
  

  

  50 
  

  

  pale 
  vellow 
  

  

  none 
  

  

  0-2178 
  0-2163 
  0-0015 
  — 
  

  

  0-5 
  

  

  0-5 
  

  

  100 
  

  

  50 
  

  

  trace 
  

  

  none 
  

  

  0-2231 
  0-2231| 
  0-0000 
  

  

  0-5 
  

  

  0-5 
  

  

  100 
  

  

  40 
  

  

  trace 
  

  

  none 
  

  

  0-2261 
  0-2235! 
  0'0026- 
  

  

  III. 
  

  

  0-5 
  

   0-5 
  

   0-5 
  

  

  0-5 
  

  

  100 
  

  

  50 
  pale 
  yellow 
  

  

  0-5 
  

  

  100 
  

  

  50 
  pale 
  yellow 
  

  

  0-5 
  

  

  100 
  

  

  50 
  pale 
  yellow 
  

  

  faint 
  

   faint 
  

   faint 
  

  

  02268 
  2265, 
  0-0003- 
  

   0-2306 
  0-2300' 
  0-0006- 
  

   0-2272J 
  0-2264! 
  0-0008- 
  

  

  The 
  same 
  general 
  phenomena 
  were 
  observed 
  in 
  all 
  these 
  

   experiments, 
  and 
  deficiencies 
  in 
  the 
  amounts 
  of 
  antimony 
  

   indicated, 
  whether 
  the 
  element 
  was 
  present 
  in 
  the 
  lower 
  or 
  

   higher 
  degree 
  of 
  oxidation 
  before 
  distillation, 
  appear 
  in 
  all, 
  

   but 
  most 
  notably 
  in 
  the 
  results 
  of 
  Tables 
  I 
  and 
  II. 
  These 
  

   losses 
  cannot 
  be 
  attributed, 
  entirely 
  at 
  least, 
  to 
  mechanical 
  

   transfer 
  in 
  the 
  process, 
  inasmuch 
  as 
  the 
  greater 
  losses 
  are 
  not 
  

   associated 
  with 
  the 
  greater 
  concentrations 
  ; 
  and, 
  furthermore, 
  

   according 
  to 
  our 
  qualitative 
  experiments 
  made 
  under 
  the 
  con- 
  

   ditions 
  of 
  these 
  determinations, 
  no 
  antimony, 
  so 
  far 
  as 
  we 
  

   could 
  observe, 
  passes 
  into 
  the 
  distillate. 
  If 
  the 
  coloration 
  of 
  

   the 
  liquid 
  on 
  cooling 
  were 
  due 
  to 
  the 
  liberation 
  of 
  iodine 
  by 
  

   the 
  action 
  of 
  air 
  upon 
  the 
  hydriodic 
  acid 
  the 
  iodine 
  thus 
  set 
  

   free 
  might 
  be 
  counted 
  upon 
  to 
  oxidize 
  a 
  corresponding 
  portion 
  

   of 
  the 
  antimony 
  in 
  the 
  neutralization, 
  and 
  so 
  to 
  occasion 
  a 
  

   deficiency 
  in 
  the 
  indications 
  of 
  titration. 
  Against 
  this 
  sup- 
  

   position, 
  however, 
  we 
  have 
  the 
  evidence 
  of 
  experiment 
  that 
  

   the 
  greatest 
  losses 
  are 
  not 
  found 
  in 
  those 
  cases 
  in 
  which 
  color 
  

   was 
  developed 
  in 
  the 
  cooling 
  liquid. 
  Moreover, 
  in 
  all 
  cases, 
  

  

  