﻿236 
  MR 
  HENRY 
  HOW 
  ON 
  CERTAIN 
  SALTS 
  AND 
  

  

  and 
  hydrochloric 
  acid 
  are 
  found 
  in 
  the 
  liquid. 
  Nitric 
  acid 
  rapidly 
  decomposes 
  it, 
  

   with 
  formation 
  of 
  hydrochloric, 
  hydrocyanic, 
  carbonic, 
  and 
  oxalic 
  acids. 
  Sub- 
  

   mitted 
  to 
  destructive 
  distillation 
  it 
  fuses 
  and 
  blackens, 
  hydrochloric 
  acid 
  is 
  evolved 
  

   in 
  large 
  quantity, 
  and 
  towards 
  the 
  end 
  of 
  the 
  process 
  a 
  small 
  quantity 
  of 
  a 
  crys- 
  

   talline 
  sublimate 
  appears. 
  This 
  product 
  I 
  obtained 
  in 
  too 
  small 
  quantity 
  to 
  

   examine 
  thoroughly. 
  I 
  imagine 
  it, 
  however, 
  to 
  be 
  pyrocomenic 
  acid, 
  and 
  attri- 
  

   bute 
  the 
  presence 
  of 
  the 
  traces 
  of 
  chlorine 
  I 
  detected 
  to 
  the 
  impossibility 
  of 
  com- 
  

   pletely 
  purifying 
  the 
  little 
  matter 
  I 
  had 
  at 
  my 
  disposal. 
  

  

  Chlorocomenic, 
  like 
  comenic 
  acid, 
  is 
  bibasic, 
  forming 
  two 
  series 
  of 
  salts. 
  The 
  

   salts 
  I 
  chose 
  for 
  controlling 
  the 
  analysis, 
  and 
  establishing 
  the 
  saturating 
  power 
  of 
  

   the 
  acid, 
  were 
  those 
  of 
  silver. 
  

  

  Bichlorocomenate 
  of 
  Silver. 
  — 
  A 
  warm 
  aqueous 
  solution 
  of 
  the 
  acid 
  gives, 
  with 
  

   nitrate 
  of 
  silver, 
  a 
  white 
  precipitate, 
  in 
  feathery 
  crystals. 
  When 
  freed 
  from 
  the 
  

   excess 
  of 
  solution 
  of 
  silver 
  and 
  nitric 
  acid 
  by 
  washing 
  with 
  cold 
  water, 
  in 
  which 
  

   it 
  is 
  sparingly 
  soluble, 
  it 
  may 
  be 
  recrystallized 
  from 
  boiling 
  water, 
  from 
  which 
  it 
  

   separates 
  on 
  cooling 
  in 
  brilliant, 
  short, 
  prismatic 
  needles. 
  It 
  is 
  not 
  at 
  all, 
  or 
  very 
  

   slightly, 
  decomposed 
  by 
  boiling 
  in 
  water 
  when 
  no 
  free 
  nitric 
  acid 
  is 
  present. 
  The 
  

   silver, 
  in 
  the 
  following 
  analysis, 
  was 
  determined 
  by 
  precipitation 
  with 
  hydro- 
  

   chloric 
  acid 
  ; 
  the 
  ordinary 
  process 
  of 
  burning 
  the 
  salt 
  and 
  weighing 
  the 
  residuary 
  

   silver 
  being 
  inapplicable, 
  since 
  a 
  portion 
  of 
  the 
  chlorine 
  of 
  the 
  acid 
  remains 
  in 
  

   combination 
  with 
  the 
  metal 
  upon 
  ignition. 
  

  

  f 
  5-157 
  grains 
  dried 
  at 
  212° 
  gave 
  

   12-490 
  ... 
  chloride 
  of 
  silver. 
  

  

  

  Experiment. 
  

   39-03 
  

  

  Calculation. 
  

  

  

  Carbon, 
  

   Hydrogen, 
  

   Oxygen, 
  . 
  

   Chlorine, 
  . 
  

   Oxide 
  of 
  silvejr, 
  

  

  24-19 
  C 
  12 
  

   067 
  H 
  2 
  

   24-19 
  9 
  

   11-94 
  CI 
  

   39-01 
  AgO 
  

  

  72 
  

   2 
  

  

  72 
  

   35-5 
  

   1161 
  

  

  100-00 
  100-00 
  297-6 
  

  

  The 
  composition 
  of 
  the 
  salt, 
  when 
  dried 
  at 
  212°, 
  is 
  therefore 
  represented 
  by 
  

   the 
  formula 
  

  

  AgO,HO,C 
  12 
  (*}o 
  8 
  . 
  

  

  The 
  crystallized 
  salt 
  appears 
  to 
  be 
  a 
  combination 
  of 
  the 
  above 
  with 
  water, 
  in 
  

   the 
  proportion 
  of 
  three 
  equivalents 
  of 
  the 
  latter 
  to 
  two 
  of 
  the 
  former 
  ; 
  the 
  two 
  

   specimens 
  of 
  the 
  salt 
  giving 
  this 
  indication 
  were 
  of 
  different 
  preparations. 
  

  

  f 
  5-674 
  grains 
  air-dry 
  salt 
  lost 
  at 
  212° 
  

   ( 
  0-230 
  ... 
  water. 
  

  

  f 
  5-428 
  grains 
  air-dry 
  salt 
  lost 
  at 
  212° 
  

   | 
  0-253 
  ... 
  water. 
  

  

  