﻿ITS 
  PRODUCTS 
  OF 
  DECOMPOSITION. 
  

  

  67 
  

  

  The 
  change 
  which 
  takes 
  place 
  in 
  this 
  manner 
  is 
  not 
  always 
  complete, 
  and 
  the 
  

   granular 
  crystals 
  are 
  often 
  mixed 
  with 
  unchanged 
  yellow 
  powder. 
  When 
  the 
  

   chloride 
  of 
  platinum 
  is 
  added 
  to 
  a 
  more 
  dilute 
  solution 
  of 
  hydrochlorate 
  of 
  co- 
  

   deine, 
  precipitation 
  does 
  not 
  take 
  place 
  immediately, 
  but 
  in 
  a 
  short 
  time 
  the 
  salt 
  

   is 
  deposited 
  in 
  minute 
  tufts 
  of 
  silky 
  needles. 
  The 
  salt 
  is 
  soluble 
  in 
  boiling 
  water, 
  

   and 
  is 
  deposited 
  on 
  cooling 
  partly 
  in 
  grains, 
  partly 
  as 
  a 
  powder. 
  By 
  this 
  process, 
  

   however, 
  it 
  is 
  partially 
  changed 
  ; 
  and 
  I 
  have 
  ascertained 
  that 
  by 
  ebullition, 
  with 
  

   excess 
  of 
  chloride 
  of 
  platinum, 
  it 
  is 
  completely 
  decomposed. 
  I 
  have 
  not 
  as 
  yet, 
  

   however, 
  followed 
  up 
  this 
  observation. 
  I 
  at 
  first 
  attempted 
  to 
  purify 
  the 
  salt 
  by 
  

   solution 
  in 
  water 
  and 
  alcohol, 
  in 
  which 
  it 
  is 
  also 
  soluble 
  ; 
  and 
  a 
  number 
  of 
  ana- 
  

   lyses 
  were 
  made, 
  which 
  gave 
  extremely 
  contradictory 
  results 
  ; 
  but 
  by 
  precipita- 
  

   tion 
  in 
  the 
  cold, 
  and 
  without 
  excess 
  of 
  platinum, 
  sufficiently 
  uniform 
  results 
  were 
  

   obtained. 
  

  

  When 
  dried 
  at 
  212°, 
  the 
  salt 
  retains 
  an 
  equivalent 
  of 
  water, 
  which 
  is 
  expelled 
  

   at 
  250°, 
  but 
  not 
  without 
  occasioning 
  partial 
  decomposition 
  of 
  the 
  substance, 
  

   which 
  evolves 
  acid, 
  and 
  acquires 
  a 
  brownish 
  colour. 
  The 
  following 
  are 
  the 
  re- 
  

   sults 
  of 
  analysis 
  : 
  — 
  

  

  H 
  

  

  240 
  grains 
  of 
  platinum 
  salt, 
  dried 
  at 
  212°, 
  gave 
  

   072 
  ... 
  of 
  carbonic 
  acid, 
  and 
  

   2-925 
  ... 
  water. 
  

  

  II. 
  

  

  III. 
  

  

  IV. 
  

  

  9* 
  3 
  94 
  grains 
  of 
  platinum 
  salt 
  gave 
  

   14*593 
  ... 
  of 
  carbonic 
  acid, 
  and 
  

   3*912 
  ... 
  of 
  water. 
  

  

  7*648 
  grains 
  of 
  platinum 
  salt 
  gave 
  

   11*694 
  ... 
  of 
  carbonic 
  acid, 
  and 
  

   3*450 
  ... 
  of 
  water. 
  

  

  6*665 
  grains 
  of 
  platinum 
  salt 
  gave 
  

   10*230 
  ... 
  of 
  carbonic 
  acid, 
  and 
  

   2*835 
  ... 
  of 
  water. 
  

  

  7*383 
  grains 
  of 
  platinum 
  salt 
  gave 
  

   11*372 
  ... 
  of 
  carbonic 
  acid, 
  and 
  

   3*304 
  ... 
  of 
  water. 
  

  

  7"247 
  grains 
  platinum 
  salt 
  gave 
  1*400 
  grains 
  platinum, 
  =19*31 
  per 
  cent. 
  

   10030 
  ... 
  ... 
  1*920 
  ... 
  =19*14 
  ... 
  

  

  9*775 
  

   10*471 
  

   8*428 
  

   6*790 
  

   5*052 
  

  

  1*850 
  

   2*020 
  

   1*600 
  

   1*296 
  

   0*960 
  

  

  = 
  18*92 
  

   = 
  19*32 
  

   = 
  18-98 
  

   = 
  19-08 
  

   = 
  19-00 
  

  

  Carbon, 
  

  

  Hydrogen, 
  

  

  Nitrogen, 
  

  

  Oxygen, 
  

  

  Chlorine, 
  

  

  Platinum, 
  

  

  I. 
  

  

  41*70 
  

   4*49 
  

  

  19*31 
  

  

  II. 
  

  

  42*36 
  

   4-62 
  

  

  19*14 
  

  

  III. 
  

  

  41*70 
  

   5*01 
  

  

  18-92 
  

  

  IV. 
  

  

  41*80 
  

   4*72 
  

  

  19*32 
  

  

  V. 
  

  

  42-00 
  

  

  4-97 
  

  

  18-98 
  

  

  VI. 
  

  

  VII. 
  

  

  19*08 
  

  

  19*00 
  

  

  