﻿M. 
  Austin 
  — 
  Double 
  Ammonium 
  Phosphates. 
  215. 
  

  

  until 
  the 
  solution 
  was 
  alkaline 
  to 
  litmus. 
  After 
  heating 
  until 
  

   the 
  solution 
  became 
  crystalline, 
  the 
  whole 
  stood 
  three 
  hours 
  in 
  

   case 
  of 
  (1) 
  of 
  the 
  table 
  and 
  sixteen 
  hours 
  in 
  case 
  of 
  (2) 
  and 
  

   (3), 
  before 
  filtering. 
  In 
  experiments 
  (4) 
  to 
  (12), 
  inclusive, 
  

   recorded 
  in 
  the 
  table, 
  precipitation 
  was 
  made 
  in 
  the 
  same 
  man- 
  

   ner 
  as 
  in 
  (1) 
  to 
  (3) 
  in 
  presence 
  of 
  varying 
  amounts 
  of 
  ammo- 
  

   nium 
  chloride, 
  and 
  the 
  precipitates 
  were 
  filtered 
  after 
  standing 
  

   as 
  stated 
  below 
  in 
  the 
  table. 
  It 
  is 
  clear 
  from 
  the 
  results 
  that 
  the 
  

   cadmium 
  separates 
  out 
  completely 
  on 
  long 
  standing 
  only. 
  

   Moreover, 
  the 
  ideal 
  condition 
  of 
  the 
  ammonium 
  cadmium 
  

   phosphate 
  is 
  obtained 
  only 
  when 
  an 
  abundance 
  of 
  ammonium 
  

   chloride 
  is 
  present 
  ; 
  but 
  large 
  amounts 
  of 
  ammonium 
  chloride 
  

  

  

  

  

  Table 
  

  

  IV. 
  

   Cd.,P.,Ov 
  

  

  

  

  

  Cd.,P20T 
  

  

  

  

  

  correspond- 
  

  

  

  

  Time 
  

  

  corresponding 
  

  

  

  Error 
  in 
  

  

  ing 
  to 
  Cd 
  

  

  

  

  of 
  

  

  to 
  CdCla. 
  

  

  

  

  terms 
  of 
  

  

  found 
  in 
  

  

  HXaITH4P04 
  

  

  

  stand- 
  

  

  Taken. 
  

  

  Found. 
  

  

  Error. 
  

  

  Cadmium. 
  

  

  the 
  filtrate. 
  

  

  - 
  4H2O. 
  

  

  NH4CI 
  

  

  • 
  ing. 
  

  

  grm. 
  

  

  grm. 
  

  

  grm. 
  

  

  grm. 
  

  

  grm. 
  

  

  grm. 
  

  

  grm. 
  

  

  hrs. 
  

  

  < 
  1) 
  0-6972 
  

  

  06201 
  

  

  0-0771- 
  

  

  0-0434- 
  

  

  0-0059 
  

  

  4-5 
  

  

  

  

  3 
  

  

  ( 
  2) 
  0-6972 
  

  

  0-6135 
  

  

  00837- 
  

  

  0-0471- 
  

  

  none 
  

  

  4-5 
  

  

  

  

  16 
  

  

  ( 
  3) 
  0-6972 
  

  

  0-6134 
  

  

  0-0838- 
  

  

  0-0471- 
  

  

  none 
  

  

  4-5 
  

  

  -..- 
  

  

  16 
  

  

  ( 
  4) 
  0-6972 
  

  

  0-6792 
  

  

  0-0180- 
  

  

  0-0101- 
  

  

  trace 
  

  

  4-5 
  

  

  

  16 
  

  

  ( 
  5) 
  0-6972 
  

  

  0-6831 
  

  

  0-0141- 
  

  

  0079- 
  

  

  0-0113 
  

  

  4-5 
  

  

  10 
  

  

  2 
  

  

  ( 
  6) 
  0-6972 
  

  

  0-6976 
  

  

  0-0004 
  + 
  

  

  0-0002 
  + 
  

  

  trace 
  

  

  4-5 
  

  

  10 
  

  

  16 
  

  

  ( 
  7) 
  0-6972 
  

  

  0-6969 
  

  

  0-0003- 
  

  

  0-0002- 
  

  

  trace 
  

  

  4-5 
  

  

  10 
  

  

  IS 
  

  

  ( 
  8) 
  0-6972 
  

  

  0-6962 
  

  

  0-0010- 
  

  

  00006- 
  

  

  trace 
  

  

  4-5 
  

  

  10 
  

  

  16 
  

  

  ( 
  9) 
  0-6972 
  

  

  0-6891 
  

  

  0-0C81- 
  

  

  0-0045 
  — 
  

  

  0-0191 
  

  

  4-5 
  

  

  20 
  

  

  16 
  

  

  (10) 
  0-6972 
  

  

  0-6972 
  

  

  0-0000 
  

  

  0-0000 
  

  

  trace 
  

  

  4-5 
  

  

  20 
  

  

  16 
  

  

  (11) 
  0-6972 
  

  

  06942 
  

  

  0-0030- 
  

  

  0-0016- 
  

  

  trace 
  

  

  4-5 
  

  

  20 
  

  

  16 
  

  

  (12) 
  0-6972 
  

  

  0-6737 
  

  

  00235- 
  

  

  00132- 
  

  

  0-0304 
  

  

  4-5 
  

  

  30 
  

  

  16 
  

  

  (13) 
  0-6972 
  

  

  0-5655 
  

  

  0-1317- 
  

  

  00741- 
  

  

  0-1378 
  

  

  4-5 
  

  

  30 
  

  

  16 
  

  

  (14) 
  0-6972 
  

  

  0-6922 
  

  

  0-0050- 
  

  

  0-0023- 
  

  

  0-0088 
  

  

  4-5 
  

  

  10 
  

  

  16 
  

  

  (15) 
  0-6972 
  

  

  0-3209 
  

  

  0-3763- 
  

  

  0-2117- 
  

  

  0-2449 
  

  

  4-5 
  

  

  

  

  16 
  

  

  dissolve 
  this 
  salt. 
  In 
  (14), 
  where 
  ammonia 
  was 
  added 
  after 
  

   precipitation 
  was 
  complete, 
  the 
  salt 
  dissolved 
  somewhat 
  ; 
  also 
  

   in 
  (15), 
  where 
  the 
  solution 
  was 
  left 
  faintly 
  acid 
  with 
  acetic 
  acid, 
  

   a 
  large 
  part 
  of 
  the 
  salt 
  was 
  dissolved. 
  These 
  weights 
  of 
  cad- 
  

   mium 
  dissolved 
  in 
  the 
  filtrate 
  were 
  obtained 
  by 
  treating 
  the 
  

   filtrates 
  with 
  sulphuretted 
  hydrogen, 
  dissol 
  ving 
  the 
  sulphide 
  in 
  

   nitric 
  acid, 
  and 
  weighing 
  as 
  oxide 
  after 
  precipitating 
  with 
  

   sodium 
  carbonate. 
  

  

  The 
  ammonium 
  cadmium 
  phosphate 
  is 
  obtained 
  in 
  ideal 
  con- 
  

   dition 
  by 
  precipitating 
  with 
  microcosmic 
  salt 
  in 
  presence 
  of 
  

   10 
  grms. 
  ammonium 
  chloride 
  in 
  a 
  total 
  volume 
  of 
  100^°^ 
  to 
  

   150cm 
  — 
  shown 
  in 
  (6), 
  (7) 
  and 
  (8) 
  — 
  filtering 
  after 
  standing 
  some 
  

   time. 
  On 
  drying 
  and 
  igniting 
  the 
  pyrophosphate 
  is 
  left. 
  

   Yery 
  large 
  amounts 
  of 
  ammonium 
  chloride 
  — 
  30 
  grms. 
  — 
  dis- 
  

   solve 
  the 
  salt, 
  and 
  seem 
  to 
  tend 
  to 
  cause 
  the 
  formation 
  of 
  a 
  

  

  