﻿M. 
  Austin 
  — 
  Double 
  Ammonium 
  Phosphates. 
  207 
  

  

  salts 
  and 
  free 
  ammonia. 
  No 
  double 
  ammonium 
  phosphate 
  of 
  

   either 
  calcium, 
  strontium, 
  or 
  barium 
  was 
  produced 
  under 
  any 
  

   condition. 
  As 
  is 
  well 
  known, 
  mercury 
  does 
  form 
  an 
  ammo- 
  

   nium 
  mercury 
  phosphate, 
  but 
  the 
  salt 
  is 
  soluble 
  to 
  so 
  great 
  a 
  

   degree 
  in 
  ammonia, 
  ammonium 
  chloride, 
  and 
  even 
  in 
  the 
  pre- 
  

   cipitant 
  itself, 
  that 
  nothing 
  of 
  any 
  value 
  for 
  analytical 
  work 
  

   seemed 
  likely 
  to 
  come 
  from 
  its 
  study. 
  

  

  The 
  Ammojiium 
  Beryllium 
  Phosphate. 
  

  

  The 
  ammonium 
  beryllium 
  phosphate 
  has 
  been 
  described 
  by 
  

   Eoessler* 
  as 
  a 
  crystalline 
  salt 
  produced 
  by 
  boiling 
  some 
  time 
  

   in 
  ammoniacal 
  solution 
  the 
  phosphate 
  precipitated 
  by 
  ammo- 
  

   nium 
  phosphate, 
  though 
  the 
  best 
  results 
  of 
  this 
  treatment 
  

   failed 
  to 
  yield 
  the 
  ideal 
  constitution 
  of 
  this 
  salt, 
  NH^BePO^. 
  

   This 
  same 
  precipitate 
  can 
  not 
  be 
  obtained, 
  Eoessler 
  further 
  

   states, 
  by 
  using 
  a 
  sodium 
  salt 
  as 
  the 
  precipitant. 
  In 
  order 
  to 
  

   follow 
  out 
  this 
  work 
  of 
  Roessler, 
  a 
  solution 
  of 
  beryllium 
  

   chloride 
  for 
  use 
  was 
  prepared 
  as 
  follows: 
  The 
  pure 
  beryllium 
  

   chloride 
  of 
  commerce 
  was 
  dissolved 
  in 
  as 
  little 
  water 
  as 
  possi- 
  

   ble 
  and 
  treated 
  for 
  the 
  precipitation 
  of 
  aluminum 
  by 
  etherial 
  

   hydrochloric 
  acid.f 
  After 
  filtering 
  and 
  evaporating 
  from 
  the 
  

   filtrate 
  the 
  ether 
  and 
  a 
  part 
  of 
  the 
  hydrochloric 
  acid, 
  the 
  beryl- 
  

   lium 
  was 
  precipitated 
  with 
  ammonia, 
  filtered 
  to 
  remove 
  any 
  

   members 
  of 
  the 
  magnesium 
  group, 
  and 
  washed 
  free 
  from 
  

   ammonium 
  chloride. 
  The 
  larger 
  part 
  of 
  the 
  precipitate 
  was 
  

   dissolved 
  in 
  hydrochloric 
  acid 
  in 
  slight 
  excess, 
  and 
  boiled 
  with 
  

   the 
  reserved 
  portion. 
  After 
  filtering, 
  the 
  solution 
  was 
  diluted 
  

   to 
  definite 
  volume 
  and 
  standardized 
  by 
  precipitating 
  measured 
  

   portions 
  of 
  the 
  solution 
  with 
  ammonia, 
  filtering 
  on 
  asbestos 
  

   under 
  pressure 
  in 
  a 
  perforated 
  platinum 
  crucible, 
  igniting 
  the 
  

   residue 
  and 
  weighing 
  as 
  the 
  oxide. 
  The 
  results 
  recorded 
  in 
  

   section 
  A 
  of 
  the 
  following 
  table 
  were 
  obtained 
  by 
  precipitating 
  

   definite 
  volumes 
  of 
  the 
  pure 
  solution 
  of 
  beryllium 
  chloride 
  

   with 
  ammonium 
  phosphate 
  in 
  a 
  platinum 
  dish, 
  dissolving 
  the 
  

   precipitate 
  in 
  hydrochloric 
  acid 
  in 
  faint 
  excess, 
  and 
  while 
  hot 
  

   precipitating 
  slowly 
  with 
  dilute 
  ammonia, 
  boiling 
  (while 
  the 
  

   solution 
  was 
  kept 
  distinctly 
  ammoniacal) 
  until 
  the 
  flocky 
  pre- 
  

   cipitate 
  was 
  entirely 
  converted 
  to 
  a 
  fine, 
  powdery, 
  semi-crystal- 
  

   line, 
  rapidly 
  subsiding 
  mass. 
  A 
  quarter 
  to 
  a 
  half 
  hour 
  is 
  

   necessary 
  under 
  the 
  most 
  favorable 
  conditions 
  to 
  cause 
  this 
  

   conversion. 
  After 
  cooling, 
  the 
  precipitate 
  was 
  filtered 
  off 
  on 
  

   asbestos 
  under 
  pressure 
  in 
  a 
  perforated 
  platinum 
  crucible, 
  

   washed 
  carefully 
  with 
  distilled 
  water, 
  dried, 
  ignited 
  and 
  

   weighed. 
  The 
  filtrate 
  was 
  tested 
  for 
  beryllium 
  by 
  boiling 
  

  

  * 
  Fresenlus, 
  Zeitschrift 
  fiir 
  analyt. 
  Cliemie, 
  1878, 
  148. 
  

   f 
  This 
  Journal, 
  vol. 
  iv, 
  111. 
  

  

  