334 
Abstracts  of  Theses  on  Chemical  Subjects. 
Am.  Jour.  Pharm. 
July,  1906. 
of  experiments  and  analyses  made  by  himself  Mr.  Shearer  concludes 
that  it  is  impossible,  even  under  the  most  favorable  conditions,  to 
obtain  compound  solution  of  chlorine  containing  *4  per  cent.  CI  as 
prepared  by  the  U.S.P.  formula. 
The  difficulty  appears  to  lie  not  with  the  process  itself,  but  with 
the  insufficient  quantities  of  potassium  chlorate  and  hydrochloric 
acid  directed  to  be  taken. 
Analyses  of  the  product  were  made  by  adding  potassium  iodide 
and  dilute  sulphuric  acid  and  titrating  the  liberated  iodine  with 
sodium  thiosulphate  V.  S. 
Following  are  the  results  obtained  in  eight  experiments,  the  first 
three  being  made  by  U.S.P.  quantities  and  the  remainder  by  varying 
quantities  of  acid  and  chlorate  ; — 
Sample 
No. 
Gms. 
KC103 
C.  C. 
HC1 
Water 
to  make 
Per  cent.  CI  found 
immediately  after. 
•1488 
29  days 
I 
1.25 
4.5 
250  c.c. 
•0914 
29  days 
2 
<  c 
« < 
•0943 
•0686 
21  days 
3 
<  ( 
•21 
•1134 
21  days 
4 
2*5 
<< 
«< 
•1803 
•1048 
21  days 
5 
1*25 
6 
( < 
•280I 
•1619 
21  days 
6 
1-25 
7-5 
<  I 
•2962 
•1619 
21  days 
7 
1-25 
9 
'3447 
•H34 
8 
2-50 
9 
•4116 
In  view  of  the  fact  that  the  more  nearly  saturated  solutions  lose 
CI  more  rapidly  than  the  weak  ones,  Mr.  Shearer  suggests  making 
the  requirements  -i  per  cent.  CI  and  diluting  the  stronger  prepara- 
tion to  the  necessary  extent. 
It  is  stated  that  if  a  fluid  ounce  of  chlorine  water  (-4  per  cent. 
CI)  is  added  to  a  solution  of  14  grains  pure  ferrous  sulphate  no 
blue  color  will  appear  upon  addition  of  potassium  ferricyanide.  A 
quick  assay  of  chlorine  water  could  thus  be  made  by  determining 
the  amount  of  the  preparation  required  to  oxidize  the  iron  salt. 
Adding  the  necessary  amount  of  water  would  then  insure  a  weaker 
but  uniform  product. 
