﻿396 
  Gooch 
  and 
  Kobayashi 
  — 
  Electrolytic 
  Analysis. 
  

  

  Electrolysis 
  of 
  Lead 
  Nitrate. 
  

  

  (Volume 
  of 
  solution, 
  100 
  cm 
  3 
  : 
  volume 
  of 
  nitric 
  acid 
  present, 
  30 
  cm 
  3 
  .) 
  

  

  Lead 
  Revolutions 
  

  

  taken 
  as 
  Lead 
  Cur- 
  of 
  anode 
  

  

  nitrate 
  found 
  Error 
  Initial 
  rent 
  Time 
  per 
  

  

  grm. 
  grm. 
  grm. 
  amp. 
  volt 
  min. 
  minute 
  

  

  Amount 
  of 
  suspended 
  lead 
  dioxide 
  large 
  at 
  end 
  of 
  electrolysis. 
  

   *0-1002 
  0*0929 
  — 
  0-0073 
  2'9 
  6" 
  120 
  150 
  

  

  0-1015 
  0-0994 
  —0-0021 
  3- 
  5'8 
  110 
  100 
  approx. 
  

  

  0-1014 
  0-0991 
  —0-0023 
  3 
  '5 
  6*7 
  120 
  100 
  " 
  

  

  Amount 
  of 
  suspended 
  lead 
  dioxide 
  small 
  at 
  end 
  of 
  electrolysis 
  : 
  

  

  e 
  end. 
  

  

  Urea 
  added 
  20 
  minutes 
  befor 
  

  

  0-1001 
  0-0991 
  —0-0010 
  4- 
  6 
  

  

  0-1007 
  0-0996 
  —0-0011 
  4- 
  6 
  

  

  ■fO-1001 
  0-0988 
  —0-0013 
  4* 
  6 
  

  

  fO-1009 
  0*1000 
  —0-0009 
  4- 
  5 
  

  

  5 
  90 
  150 
  

  

  3 
  90 
  150 
  

  

  90 
  150 
  

  

  8 
  90 
  150 
  

  

  Amount 
  of 
  suspended 
  lead 
  dioxide 
  inappreciable 
  at 
  end 
  of 
  electrolysis 
  

   Urea 
  added 
  20 
  minutes 
  before 
  end. 
  

  

  0*1002 
  0-1008 
  +0-0006 
  3 
  

  

  0-1009 
  0-1013 
  +0-0004 
  3 
  

  

  0-1005 
  0-1003 
  —0-0002 
  4 
  

  

  0-1002 
  0-0998 
  —0 
  0004 
  3 
  

  

  0-0999 
  0995 
  —0-0004 
  3 
  

  

  0-1003 
  0-0998 
  —0-0005 
  3 
  

  

  0-0995 
  0-0991 
  -0*0004 
  3 
  

  

  0-1010 
  0-1014 
  +0-0004 
  3 
  

  

  5-8 
  90 
  150 
  

  

  7- 
  90 
  150 
  

  

  6- 
  90 
  150 
  

  

  5 
  6-2 
  90 
  150 
  

  

  5 
  5-8 
  100 
  150 
  

  

  7 
  6- 
  90 
  150 
  

  

  7 
  6-2 
  90 
  150 
  

  

  8 
  6-4 
  90 
  150 
  

  

  Suspended 
  lead 
  dioxide 
  removed 
  by 
  filtration 
  and 
  the 
  filtrate 
  again 
  

   electrolysed 
  after 
  addition 
  of 
  urea. 
  

  

  01012 
  0-1008 
  —0-0004 
  3*8 
  6*3 
  90 
  150 
  

  

  From 
  these 
  results 
  it 
  is 
  apparent 
  that 
  lead 
  may 
  be 
  deter- 
  

   mined 
  accurately 
  by 
  the 
  aid 
  of 
  platinum 
  electrodes 
  of 
  small 
  

   dimensions, 
  the 
  filtering 
  tube, 
  and 
  the 
  weighed 
  cell. 
  The 
  

   process 
  is 
  successful 
  when 
  the 
  electrolysis 
  is 
  prolonged 
  until 
  

   the 
  lead 
  dioxide 
  which 
  becomes 
  detached 
  from 
  the 
  anode 
  in 
  

   the 
  early 
  stages 
  of 
  the 
  operation 
  has 
  been 
  dissolved 
  and 
  again 
  

   deposited 
  on 
  the 
  anode, 
  or 
  when 
  the 
  electrolyte 
  is 
  filtered 
  

   from 
  any 
  suspended 
  lead 
  dioxide 
  and 
  again 
  submitted 
  to 
  elec- 
  

   trolysis. 
  

  

  It 
  is 
  plain, 
  therefore, 
  that 
  the 
  use 
  of 
  the 
  small 
  electrodes, 
  

   filtering 
  tube, 
  and 
  weighed 
  cell, 
  modified 
  in 
  the 
  manner 
  

   described, 
  may 
  be 
  extended 
  to 
  solutions 
  of 
  considerable 
  volume 
  

   (100 
  cm 
  3 
  ). 
  The 
  time 
  required, 
  however, 
  to 
  complete 
  the 
  depo- 
  

   sition 
  of 
  a 
  given 
  amount 
  of 
  material 
  naturally 
  increases 
  with 
  

   the 
  volume 
  of 
  the 
  solution. 
  

  

  * 
  No 
  urea 
  added. 
  

  

  f 
  Potassium 
  nitrite 
  added, 
  and 
  subsequently 
  urea, 
  before 
  end 
  of 
  elec- 
  

   trolysis. 
  

  

  