﻿230 
  MR 
  HENRY 
  HOW 
  ON 
  CERTAIN 
  SALTS 
  AND 
  

  

  As 
  before 
  mentioned, 
  salts 
  containing 
  various 
  amounts 
  of 
  water 
  of 
  crystalliza- 
  

   tion 
  are 
  formed 
  in 
  more 
  or 
  less 
  concentrated 
  solutions. 
  The 
  crystals 
  of 
  that 
  one 
  

   whose 
  analysis 
  in 
  the 
  dry 
  state 
  is 
  given, 
  were 
  in 
  the 
  form 
  of 
  groups 
  of 
  minute 
  

   prisms. 
  They 
  were 
  deposited 
  in 
  a 
  tolerably 
  dilute 
  fluid, 
  and 
  lost 
  five 
  atoms 
  of 
  

   water 
  in 
  drying. 
  

  

  f 
  11-785 
  grains 
  lost 
  at 
  250° 
  

   { 
  2-145 
  water. 
  

  

  which 
  number 
  gives 
  a 
  per-centage 
  of 
  18*20 
  : 
  17 
  50, 
  being 
  that 
  corresponding 
  to 
  

   the 
  formula 
  

  

  2 
  CaO, 
  C 
  l2 
  H 
  2 
  8 
  , 
  2 
  Ho 
  + 
  5 
  aq. 
  

  

  By 
  employing 
  very 
  dilute 
  solutions, 
  a 
  salt 
  was 
  got 
  in 
  very 
  well-defined, 
  small 
  ; 
  

   brilliant 
  crystals, 
  which 
  lost, 
  at 
  250' 
  Fahr., 
  3127 
  per 
  cent, 
  of 
  water: 
  now 
  the 
  

   number 
  31 
  82 
  is 
  that 
  required 
  by 
  the 
  formula 
  

  

  2 
  CaO, 
  C 
  12 
  H 
  2 
  8 
  , 
  2 
  Ho 
  + 
  1 
  1 
  aq. 
  

  

  This 
  dried 
  salt 
  gave 
  26*35 
  per 
  cent, 
  of 
  lime, 
  which 
  agrees 
  perfectly 
  well 
  with 
  the 
  

   results 
  obtained 
  in 
  the 
  former 
  case. 
  

  

  All 
  these 
  neutral 
  salts 
  are 
  converted 
  into 
  basic 
  compounds 
  by 
  simple 
  ebulli- 
  

   tion 
  in 
  water. 
  

  

  Salts 
  of 
  Baryta 
  with 
  Comenic 
  Acid. 
  

  

  Carbonate 
  of 
  baryta 
  is 
  partially 
  decomposed 
  by 
  comenic 
  acid 
  in 
  the 
  cold, 
  and 
  

   completely 
  so 
  when 
  heated 
  with 
  an 
  excess 
  in 
  water, 
  the 
  acid 
  comenate 
  of 
  baryta 
  

   being 
  produced. 
  On 
  the 
  other 
  hand, 
  when 
  a 
  mixture 
  of 
  the 
  acid 
  and 
  an 
  excess 
  of 
  

   carbonate 
  of 
  baryta 
  is 
  boiled 
  with 
  water, 
  effervescence 
  ensues, 
  but 
  the 
  comenic 
  

   acid 
  remains 
  undissolved, 
  being 
  in 
  combination 
  with 
  the 
  earth 
  in 
  form 
  of 
  a 
  basic 
  

   salt. 
  I 
  readily 
  obtained 
  both 
  an 
  acid 
  and 
  a 
  neutral 
  salt 
  by 
  double 
  decomposition. 
  

  

  Bicomenate 
  of 
  Baryta. 
  — 
  A 
  cold 
  saturated 
  aqueous 
  solution 
  of 
  bicomenate 
  of 
  

   ammonia 
  gives, 
  with 
  a 
  solution 
  of 
  chloride 
  of 
  barium, 
  an 
  immediate 
  precipitate 
  of 
  

   a 
  crystalline 
  nature. 
  With 
  more 
  dilute 
  solutions, 
  the 
  salt 
  appears 
  more 
  slowly 
  

   in 
  well-defined 
  transparent 
  rhombs. 
  It 
  is 
  readily 
  soluble 
  in 
  boiling 
  water, 
  and 
  

   has 
  a 
  strong 
  acid 
  reaction. 
  It 
  loses 
  its 
  water 
  of 
  crystallization 
  at 
  212°, 
  but 
  very 
  

   slowly 
  ; 
  the 
  dried 
  salt 
  fuses 
  on 
  ignition. 
  

  

  f 
  5-878 
  

   I 
  6-874 
  

   | 
  0-905 
  

  

  grains 
  dried 
  at 
  212 
  c 
  

   carbonic 
  acid 
  

   water. 
  

  

  gave 
  

   , 
  and 
  

  

  

  

  f 
  5-797 
  

   | 
  2-525 
  

  

  grains 
  dried 
  at 
  212° 
  

   carbonate 
  of 
  

  

  gave, 
  on 
  ignition, 
  

   baryta. 
  

  

  

  

  Experiment. 
  

  

  31-89 
  

   1-71 
  

  

  33-81 
  

  

  

  Calculation. 
  

  

  

  Carbon, 
  

   Hydrogen, 
  

   Oxygen, 
  . 
  

   Baryta, 
  

  

  32-19 
  

  

  1-34 
  

  

  32-21 
  

  

  34-26 
  

  

  C 
  12 
  

  

  o 
  9 
  

  

  BaO 
  

  

  72 
  

   3 
  

   72 
  

   76-64 
  

  

  100-00 
  100-00 
  223-64 
  

  

  