Am.  Jour.  Pharm.  > 
April,  1910.  j 
Chlorinated  Soda  Solution. 
explosive  violence  of  the  oxides  of  chlorine  which  are  generated  in 
the  chlorate  process,  would  be  avoided;  also  the  difficulties  pointed 
out  by  Shearer,6  as  the  impossibility  "  even  under  the  most  favor- 
able conditions,  to  obtain  compound  solution  of  chlorine  containing 
0.4  per  cent.  CI  as  prepared  by  the  U.S. P.  formula,"  would  be 
overcome ;  especially,  when  we  remember  that  in  passing  the  chlorine 
through  distilled  water  preliminary  to  its  entering  the  sodium 
hvdroxide  solution,  we  actually  obtain  in  the  one  operation  both 
chlorine  water  and  chlorinated  soda  solution.  Finally,  the  fact  that 
the  apparatus  required  is  very  simple  and  that  it  need  not  occupy 
much  space,  as  well  as  the  fact  that  the  chlorine  is  readily  generated 
by  simply  turning  the  stop-cock  of  the  separator}-  funnel  so  as  to 
allow  the  strong  hydrochloric  acid  to  come  in  contact  with  the  potas- 
sium permanganate,  and  that  the  operation  can  be  carried  out  so  as 
not  to  notice  the  slightest  odor  of  chlorine  in  the  room  in  which  this 
operation  is  carried  out,  would  seem  to  offer  the  additional  advan- 
tage of  permitting  the  apparatus  to  be  permanently  set  up  and  thus 
kept  readv  for  use  whenever  free  chlorine  is  wanted;  while  by  also 
keeping  ready  for  use  a  supply  of  the  sodium  hydroxide  solution,  the 
chlorinated  soda  solution  could  be  prepared  in  a  very  short  time 
and  with  very  little  attention. 
It  might  be  objected,  however,  that  the  permanganate  method 
would  increase  the  cost  of  the  chlorine  very  much.  But  when  we 
remember  that  a  given  weight  of  potassium  permanganate  can  be 
used  in  making  more  than  five  times  as  much  chlorinated  soda  solu- 
tion as  an  equal  weight  of  even  the  best  commercially  obtainable 
chlorinated  lime,  this  objection  loses  much  of  the  force  whicn  it 
might  appear  at  first  glance  to  have.  Thus  according  to  an  experi- 
ment of  Amy  and  Dawson,7  in  which  100  Gm.  of  chlorinated  lime 
of  an  available  chlorine  strength  which  represented,  according  to 
these  authors,  about  the  best  that  is  ordinarily  obtainable  commer- 
cially, was  used  in  making  1000  Gm.  of  chlorinated  soda  solution 
by  the  U.S. P.  method,  the  resulting  solution  contained  only  1.65 
per  cent,  available  chlorine  ;  or  a  total  available  chlorine  of  16.5  Gm., 
the  cost  of  the  chlorinated  lime  for  which  would  ordinarily  be  about 
2  cents;  while  on  the  basis  of  27.3  Gm.  KMn04  +  T75  c-c-  hydro- 
chloric acid  yielding  29  Gm.  available  chlorine  in  the  chlorinated 
eProc.  A.  Ph.  A.,  55,-669  (1907). 
TProc.  A.  Ph.  A.,  56,  842  (1908). 
