﻿394: 
  Gooch 
  and 
  Kobayashi 
  — 
  -Electrolytic 
  Analysis. 
  

  

  solution 
  was 
  standardized 
  by 
  the 
  electrolysis 
  of 
  such 
  portions 
  

   with 
  a 
  platinum 
  crucible 
  used 
  as 
  the 
  rotating 
  cathode.* 
  In 
  

   every 
  case 
  correction 
  was 
  made 
  for 
  change 
  of 
  volume 
  due 
  to 
  

   the 
  difference 
  between 
  the 
  temperature 
  at 
  the 
  time 
  of 
  the 
  

   experiment 
  and 
  that 
  at 
  the 
  time 
  of 
  standardization, 
  upon 
  the 
  

   assumption 
  that 
  the 
  coefficient 
  of 
  change 
  was 
  that 
  of 
  pure 
  

   water. 
  

  

  In 
  the 
  procedure 
  adopted 
  after 
  the 
  preliminary 
  experimenta- 
  

   tion, 
  portions 
  of 
  the 
  solution 
  were 
  drawn 
  from 
  a 
  burette 
  and 
  

   concentrated 
  by 
  evaporation. 
  Ammonia 
  and 
  ammonium 
  sul- 
  

   phate 
  were 
  added, 
  the 
  volume 
  was 
  adjusted 
  to 
  100 
  cm 
  3 
  , 
  and 
  

   the 
  electrolysis 
  was 
  continued 
  for 
  some 
  minutes 
  after 
  the 
  solu- 
  

   tion 
  became 
  colorless 
  and 
  always 
  until 
  dimethyl-glyoxime 
  gave 
  

   no 
  indication 
  for 
  nickel 
  in 
  a 
  small 
  portion 
  removed 
  for 
  testing. 
  

   The 
  washing 
  of 
  the 
  cathode 
  deposit 
  was 
  completed 
  by 
  soaking 
  

   in 
  water, 
  as 
  in 
  the 
  approved 
  procedure 
  described 
  above 
  for 
  the 
  

   determination 
  of 
  copper. 
  

  

  (Volume, 
  100 
  cm 
  3 
  

  

  Electrolysis 
  of 
  Nickel 
  Sulphate. 
  

  

  cathode 
  revolutions, 
  600 
  per 
  minute 
  ; 
  washing 
  completed 
  

   by 
  soaking 
  of 
  cathode 
  in 
  water.) 
  

  

  Nickel 
  

  

  taken 
  as 
  

  

  sulphate 
  

  

  grm. 
  

  

  0*0989 
  

   0-0989 
  

   0-0989 
  

  

  Nickel 
  

   found 
  

   grm. 
  

  

  Error 
  Initial 
  

   grm. 
  amp. 
  

  

  (NH 
  4 
  ) 
  2 
  

   Cur- 
  S0 
  4 
  NH4OH 
  

   rent 
  added 
  added 
  Time 
  

   volt. 
  grm. 
  cm 
  3 
  min. 
  

  

  Preliminary 
  Experiments. 
  

  

  0*0985 
  —0-0004 
  0'5 
  9'8 
  2 
  50 
  90 
  

  

  0-0972 
  — 
  0'00l7f 
  0-5 
  7'2 
  3 
  50 
  105 
  

  

  0-0990 
  +0-0001 
  0-6 
  9*3 
  4 
  100 
  135 
  

  

  Adopted 
  Procedure 
  : 
  ND 
  10 
  o 
  = 
  00 
  to 
  75 
  amp. 
  (approx.) 
  

  

  0-0989 
  

   0-0989 
  

   0-0989 
  

   0-0989 
  

   0-0989 
  

   0-0989 
  

  

  0-0994 
  

   0-0989 
  

   9-0990 
  

   0-0991 
  

   0*0986 
  

   0-0992 
  

  

  + 
  0-0005 
  

   0-0000 
  

   + 
  0-0001 
  

   + 
  0-0002 
  

   — 
  0-0003 
  

   + 
  0003 
  

  

  0-8 
  

   0-8 
  

   0-8 
  

   1-0 
  

   1-0 
  

   1-0 
  

  

  9-4 
  

  

  9-4 
  

  

  9-9 
  

  

  12-2 
  

  

  11-7 
  

  

  11-1 
  

  

  55 
  

   55 
  

   55 
  

   55 
  

   55 
  

   55 
  

  

  90 
  

  

  100 
  

  

  100 
  

  

  90 
  

  

  90 
  

  

  100 
  

  

  These 
  results 
  show 
  that 
  with 
  the 
  use 
  of 
  the 
  small 
  electrodes 
  

   approximately 
  0'1 
  grm. 
  of 
  nickel 
  may 
  be 
  deposited 
  completely 
  

   in 
  an 
  hour 
  and 
  a 
  half 
  from 
  100 
  cm 
  3 
  of 
  solution 
  charged 
  with 
  

   ammonia 
  and 
  ammonium 
  sulphate 
  by 
  means 
  of 
  a 
  current 
  of 
  

   0'8 
  to 
  1 
  amp. 
  The 
  voltage 
  required 
  under 
  the 
  conditions 
  of 
  

   the 
  experiments 
  described 
  was 
  approximately 
  10 
  or 
  12 
  volts. 
  

  

  * 
  Gooch 
  and 
  Medway, 
  this 
  Journal, 
  xv, 
  320, 
  1903. 
  

   f 
  Deposition 
  incomplete. 
  

  

  