﻿126 
  Gooch 
  and 
  Peters— 
  Determination 
  of 
  Tellurous 
  Acid. 
  

  

  and 
  titrating 
  to 
  the 
  destruction 
  of 
  color 
  with 
  the 
  standard 
  

   solution 
  of 
  arsenic. 
  It 
  is 
  essential 
  in 
  order 
  that 
  oxygen 
  may 
  

   not 
  go 
  to 
  waste 
  in 
  the 
  breaking 
  down 
  of 
  the 
  oxides, 
  that 
  more 
  

   than 
  enough 
  iodide 
  should 
  be 
  present 
  when 
  the 
  solution 
  is 
  

   acidified 
  to 
  complete 
  the 
  reduction 
  of 
  the 
  manganese 
  oxides, 
  

   or 
  else, 
  that 
  the 
  arsenious 
  acid 
  should 
  be 
  present 
  in 
  suitable 
  

   amount 
  before 
  the 
  sulphuric 
  acid 
  is 
  put 
  in. 
  This 
  latter 
  pro- 
  

   cedure 
  may 
  be 
  used 
  in 
  case, 
  for 
  any 
  reason, 
  it 
  is 
  preferred 
  not 
  

   to 
  introduce 
  more 
  iodide 
  into 
  the 
  solution 
  than 
  may 
  be 
  present 
  

   originally 
  : 
  when, 
  for 
  example, 
  a 
  direct 
  determination 
  of 
  the 
  

   iodine 
  present 
  is 
  to 
  follow. 
  

  

  

  

  

  

  Table 
  III. 
  

  

  

  

  

  

  

  

  0=: 
  

  

  16, 
  Te 
  = 
  127-5. 
  

  

  

  

  

  

  

  

  

  XaOH 
  

  

  

  

  TeOa 
  

  

  taken. 
  

  

  NaCl. 
  

  

  KBr. 
  

  

  KI. 
  

  

  Total 
  

   volume 
  

   at 
  end. 
  

  

  present 
  

  

  during 
  

  

  oxidation. 
  

  

  TeOs 
  

   found. 
  

  

  Error. 
  

  

  grm. 
  

  

  grm. 
  

  

  grm. 
  

  

  grm. 
  

  

  cm3. 
  

  

  grm. 
  

  

  grm. 
  

  

  grm. 
  

  

  0-1000 
  

  

  

  

  

  

  •5 
  

  

  160 
  

  

  0-1 
  

  

  0-1005 
  

  

  + 
  -0005 
  

  

  0-1000 
  

  

  

  

  

  

  -5 
  

  

  160 
  

  

  0-1 
  

  

  0-1001 
  

  

  + 
  0-0001 
  

  

  0-1000 
  

  

  

  

  

  

  -5 
  

  

  160 
  

  

  0-1 
  

  

  0-1003 
  

  

  + 
  0-0003 
  

  

  0-1000 
  

  

  

  

  . 
  . 
  - 
  . 
  

  

  10 
  

  

  250 
  

  

  0-1 
  

  

  0-1007 
  

  

  + 
  0-0007 
  

  

  0-2000 
  

  

  

  

  

  

  1-0 
  

  

  250 
  

  

  0-2 
  

  

  0-1997 
  

  

  — 
  0-0003 
  

  

  0-1000 
  

  

  .5 
  

  

  •5 
  

  

  -5 
  

  

  250 
  

  

  0-1 
  

  

  0-1000 
  

  

  0-0000 
  

  

  0-2100 
  

  

  1-0 
  

  

  1-0 
  

  

  1-0 
  

  

  225 
  

  

  0-2 
  

  

  02105 
  

  

  + 
  0-0005 
  

  

  0-1000 
  

  

  

  

  

  

  •5 
  

  

  160 
  

  

  1-0 
  

  

  o-ioii 
  

  

  + 
  0-0011 
  

  

  0-2000 
  

  

  

  

  

  

  1-0 
  

  

  300 
  

  

  2-0 
  

  

  0-2009 
  

  

  + 
  0-0009 
  

  

  These 
  results 
  are 
  reasonably 
  good. 
  Like 
  those 
  of 
  Table 
  I 
  

   they 
  would 
  be 
  brought 
  practically 
  in 
  the 
  average 
  to 
  the 
  figure 
  

   demanded 
  by 
  theory 
  if 
  the 
  value 
  of 
  the 
  Committee 
  of 
  the 
  Ger- 
  

   man 
  Chemical 
  Society, 
  Te 
  = 
  127, 
  were 
  to 
  be 
  taken 
  instead 
  of 
  

   Te 
  = 
  127*5, 
  the 
  value 
  of 
  Clarke 
  and 
  of 
  Richards. 
  

  

  