204 
The  Chlorinated  Compounds  of  the  U.  S.  P.  { 
Am.  Jour.  Pharm. 
April,  1895. 
directs  that  the  chlorinated  lime  shall  be  exhausted  of  its  available 
chlorine  by  repeatedly  triturating  with  water  and  pouring  off  the 
supernatant  fluid,  and  subsequently  pouring  the  residue  upon  the 
filter,  washing  it  with  the  remainder  of  the  water,  the  proportion  of 
water  used  in  exhausting  it  being  to  the  chlorinated  lime  as  6%  :  i; 
this  solution  is  then  mixed  with  the  solution  of  sodium  carbonate, 
and  the  mixture  subsequently  filtered. 
In  the  process  of  the  1880  Pharmacopoeia,  the  chlorinated  lime 
was  mixed  with  four  times  its  weight  of  water,  and  the  solution  of 
carbonate  of  soda  poured  into  the  mixture.  The  preparation  was 
allowed  to  stand  for  a  certain  length  of  time,  after  which  it  was 
strained  through  muslin,  allowed  to  settle,  and  the  clear  liquid 
removed  afterward  by  means  of  a  syphon. 
Much  has  been  written  concerning  the  composition  of  chlorinated 
compounds,  and  of  chlorinated  lime  in  particular;  but  from  a  rational 
view  of  the  subject,  it  would  be  more  natural  to  suppose  that  the 
process  in  which  the  decomposing  action  of  the  sodium  carbonate 
is  brought  to  bear  upon  the  whole  bulk  of  the  chlorinated  lime, 
instead  of  upon  washings  of  it,  which  have  been  found  to  be  far 
from  uniform,  would  be  the  one  to  give  the  greater  percentage  of 
available  chlorine.  The  results  from  several  careful  experiments 
upon  the  practicability  of  completely  exhausting  a  given  sample  of 
chlorinated  lime,  show  the  following  average : 
The  first  trituration  extracted  less  than  the  second,  and  the  avail- 
able chlorine  remaining  in  the  residue  amounted  to  about  10  per 
cent,  of  the  total. 
The  total  available  chlorine  in  the  sample  was  taken  as  ...  .  ioroo 
Working  with  the  two  processes  simultaneously,  and  using  chlor- 
inated lime  of  the  same  strength  in  both  instances,  the  writer  was 
unable,  in  any  case,  to  obtain  a  product  by  the  1890  process,  which 
contained  as  much  available  chlorine  as  that  made  by  the  1880 
Per  Cent. 
Amount  extracted  by  first  trituration 
Amount  extracted  by  second  trituration 
Washings  of  residue  extracted  
Available  chlorine  determined  in  residue 
33-28 
40-58 
14-41 
1 1  04 
Total 
99*31 
process. 
