Am.  Jour.  Pharm.  \ 
April,  1910.  J 
Chlorinated  Soda  Solution. 
chlorine  and  forming  the  hypochlorite  solution  without  noticing  the 
slightest  odor  of  chlorine  in  the  room  in  which  the  operation  is 
carried  out.  About  65  c.c.  of  hydrochloric  acid  of  sp.  gr.  1.17  is 
required  for  each  portion  of  10  Gm.  of  potassium  permanganate  used, 
the  evolution  of  chlorine  commencing  even  without  extraneous 
heating.  m 
A  chlorinated  soda  solution  was  therefore  prepared  by  Graebe's 
method  as  follows :    From  the  proportion 
70.92  :  120  : :  6 :  x  =  10.15 
we  see  that  in  order  to  have  the  proportion  of  Cl2  to  3  NaOH,  the 
amount  of  sodium  hydroxide  should  be  10.15  per  cent,  in  the  case 
of  a  solution  that  is  to  contain  6  per  cent,  available  chlorine.  For 
making  500  Gm.  of  such  a  solution  we  will  therefore  need  50.75  Gm. 
of  NaOH  and  30  Gm.  Cl2  to  419.25  Gm.  of  water;  while  on  the 
basis  of  10  Gm.  KMnD4  equals  11  Gm.  chlorine,  to  obtain  30 
Gm.  of  the  latter  approximately  27.3  Gm.  of  the  former  will  be 
required.  These  respective  quantities  of  the  several  substances  were 
therefore  used  in  making  this  solution.  The  potassium  perman- 
ganate was  placed  in  a  distilling  flask  of  about  300  c.c.  capacity, 
the  mouth  of  which  was  fitted  with  a  doubly  perforated  stopper ; 
one  of  these  perforations  being  used  for  connecting  with  the  sepa- 
ratory funnel,  into  which  175  c.c.  of  strong  hydrochloric  acid  (33 
per  cent.)  was  placed;  while  the  other  perforation  in  the  stopper 
was  used  for  uniting  by  means  of  suitable  tubing  the  inner  atmos- 
phere of  the  flask  with  that  of  the  separatory  funnel;  the  latter 
being  an  arrangement  used  by  Manchot  and  Herzog,3  an  illustra- 
tion of  which  may  also  be  seen  in  Loevenhart  and  Kastle's  4  paper 
on  the  catalytic  decomposition  of  hydrogen  peroxide.  The  delivery 
tube  of  the  flask  was  connected  with  a  small  gas  washing  bottle 
(Drexel's),  into  which  was  placed  about  50  c.c.  of  water  for  wash- 
ing the  gas  before  it  passed  into  the  sodium  hydroxide  solution. 
The  latter  was  placed  in  a  narrow-mouthed  measuring  cylinder, 
which  it  almost  filled,  and  the  gas  delivery  tube  was  made  long 
enough  to  almost  reach  the  bottom  of  the  cylinder.  When  all 
the  connections  had  been  made,  the  stop-cock  of  the  separatory 
funnel  was  turned  so  as  to  let  the  hydrochloric  acid  fall  slowly 
in  drops  on  the  solid  potassium  permanganate  in  the  flask.  The 
3  Ann.  Chem.  (Liebig),  316,  321  (1901). 
4  Amer.  Chem.  J.,  29,  397-437  (1903). 
