﻿406 
  Peters 
  — 
  Separation 
  and 
  Determination 
  of 
  Mercury. 
  

  

  

  

  

  Excess 
  

  

  

  

  

  

  

  Hg 
  

   taken 
  as 
  

   Hg 
  2 
  (NO,) 
  2 
  

  

  Hg 
  

   present 
  

  

  as 
  

   Hg(N0 
  3 
  ) 
  2 
  

  

  ammonium 
  

  

  oxalate 
  

  

  present 
  

  

  n 
  

  

  app. 
  jjj 
  

  

  HN0 
  3 
  

  

  Sp. 
  gr. 
  

  

  1-15 
  

  

  Yolume 
  

  

  at 
  

   precipi- 
  

   tation 
  

  

  Hg 
  

   found. 
  

  

  Error. 
  

  

  

  gms. 
  

  

  gms. 
  

  

  cm 
  3 
  

  

  cm 
  8 
  . 
  

  

  cm 
  3 
  . 
  

  

  gms, 
  

  

  gms. 
  

  

  

  ( 
  0*1217 
  

  

  

  

  2-4 
  

  

  

  

  100 
  

  

  0-1217 
  

  

  ±00000 
  

  

  K- 
  

  

  " 
  

  

  

  

  u 
  

  

  

  

  c; 
  

  

  0-1217 
  

  

  ±0-0000 
  

  

  

  ( 
  0-1122 
  

  

  

  

  u 
  

  

  

  a 
  

  

  0-1124 
  

  

  + 
  0-0002 
  

  

  L 
  

  

  \ 
  *' 
  

  

  0-0067 
  

  

  0-93 
  

  

  2 
  

  

  a 
  

  

  0-1130 
  

  

  + 
  0-0008 
  

  

  1 
  " 
  

  

  a 
  

  

  0-93 
  

  

  a 
  

  

  u 
  

  

  0-1112 
  

  

  —o-ooio 
  

  

  M 
  

  

  u 
  

  

  u 
  

  

  4-40 
  

  

  a 
  

  

  cc 
  

  

  0-1124 
  

  

  + 
  0-0002 
  

  

  N 
  

  

  a 
  

  

  0-0135 
  

  

  0-72 
  

  

  4 
  

  

  u 
  

  

  0-1125 
  

  

  + 
  0-0003 
  

  

  

  

  \ 
  0-2244 
  

  

  0-0071 
  

  

  1-68 
  

  

  a 
  

  

  cc 
  

  

  0-2253 
  

  

  + 
  0-0009 
  

  

  1 
  " 
  

  

  a 
  

  

  2-46 
  

  

  u 
  

  

  a 
  

  

  0-2241 
  

  

  — 
  0-0003 
  

  

  P 
  

  

  1 
  " 
  

  

  00048 
  

  

  0-54 
  

  

  i. 
  

  

  200 
  

  

  0-2248 
  

  

  + 
  0-0004 
  

  

  \ 
  " 
  

  

  a 
  

  

  2*44 
  

  

  (( 
  

  

  a 
  

  

  0-2245 
  

  

  + 
  0-0001 
  

  

  In 
  section 
  K 
  are 
  experiments 
  showing 
  the 
  accuracy 
  of 
  the 
  

   process 
  where 
  a 
  mercurous 
  salt 
  is 
  precipitated 
  in 
  the 
  absence 
  of 
  

   a 
  mercuric 
  salt. 
  A 
  small 
  amount 
  of 
  mercuric 
  salt 
  was 
  intro- 
  

   duced 
  in 
  experiments 
  L, 
  and 
  an 
  excess 
  of 
  ammonium 
  oxalate 
  

   in 
  experiment 
  M, 
  a 
  still 
  larger 
  amount 
  of 
  mercuric 
  salt 
  was 
  

   present 
  in 
  experiment 
  ~N, 
  and 
  a 
  larger 
  amount 
  of 
  mercurous 
  

   salt 
  in 
  experiments 
  under 
  O. 
  In 
  experiments 
  in 
  section 
  P 
  a 
  

   dilution 
  of 
  200 
  cm3 
  was 
  employed 
  both 
  with 
  and 
  without 
  an 
  

   excess 
  of 
  ammonium 
  oxalate. 
  All 
  the 
  results 
  are 
  within 
  

   reasonable 
  limits 
  of 
  error. 
  

  

  The 
  work 
  may 
  be 
  summed 
  up 
  briefly 
  as 
  follows 
  : 
  Mercurous 
  

   nitrate 
  may 
  be 
  estimated 
  volumetrically 
  by 
  precipitating 
  as 
  the 
  

   oxalate 
  and 
  determining 
  the 
  excess 
  of 
  the 
  precipitant 
  with 
  per- 
  

   manganate. 
  

  

  The 
  precipitated 
  mercurous 
  oxalate 
  may 
  also 
  be 
  estimated 
  

   gravimetrically 
  by 
  drying 
  it 
  over 
  sulphuric 
  acid 
  and 
  weighing 
  

   directly. 
  

  

  In 
  solutions 
  containing 
  2-5 
  per 
  cent 
  dilute 
  nitric 
  acid, 
  sp.gr. 
  

   1-15, 
  mercurous 
  salts 
  may 
  be 
  separated 
  quantitatively 
  as 
  the 
  

   oxalate 
  from 
  small 
  quantities 
  of 
  mercuric 
  salts. 
  

  

  If 
  about 
  0*12 
  gui. 
  of 
  mercury 
  is 
  present 
  as 
  the 
  nitrate 
  in 
  

   100 
  cm3 
  of 
  water, 
  about 
  12 
  per 
  cent 
  of 
  that 
  amount 
  of 
  mercury 
  

   as 
  the 
  mercuric 
  salt 
  may 
  be 
  present 
  without 
  interfering 
  with 
  

   the 
  accuracy 
  of 
  the 
  estimation, 
  and 
  even 
  20 
  per 
  cent 
  may 
  be 
  

   present 
  before 
  an 
  appreciable 
  rise 
  in 
  the 
  result 
  is 
  apparent. 
  If 
  

   the 
  amount 
  of 
  mercurous 
  salt 
  present 
  is 
  doubled, 
  the 
  amount 
  of 
  

   mercuric 
  salt 
  which 
  maybe 
  present 
  is 
  cut 
  down 
  about 
  one-half. 
  

  

  The 
  author 
  wishes 
  to 
  thank 
  Professor 
  F. 
  A. 
  Gooch 
  for 
  many 
  

   kind 
  suggestions 
  given 
  during 
  the 
  course 
  of 
  this 
  work. 
  

  

  