AreWJuTy)7oi4m'}      The  0il  °f  Argemone  Mexicana.  53 
39  c.c.  of  the  oil  was  fractionally  distilled  at  15  mm.  pressure 
when  the  following  fractions  were  obtained. 
Temperature. 
2i5°-2i7°C. 
2I7°-224°  C. 
224°-228°  C. 
228°-23I°C. 
23i°-235°  C. 
Weight  of  fraction. 
3-8i 
9.08 
9.24 
6-45 
2.79 
Remarks. 
Instantly  solidified. 
Solidified  but  contained  some  liquid. 
Liquid,  on  prolonged  keeping  a  few  crystals 
separated  out. 
Pale  brown  liquid. 
Greenish  liquid. 
Examination  of  the  Mixed  Fatty  Acids. 
The  specific  gravity  at  28 0  C.  is  0.9065  and  at  the  boiling  point 
of  water  0.8889. 
2.0688  gms.  required  for  saponification  90.4  c.c.  of  alkali. 
The  saponification  value  is  194. 
0.40745  gms.  of  oil  absorbed  0.6003  gms.  of  iodine  from  a 
solution  of  iodine  and  mercury  bichloride  in  absolute  alcohol.  The 
iodine  value  hence  is  147.4. 
To  find  out  the  neutralization  value,  3.6638  gms.  of  the  mixture 
were  diluted  with  50  c.c.  of  neutralized  alcohol,  a  drop  of  phenol- 
phthalein  solution  added  and  titrated  with  a  normal  solution  of 
caustic  potash.  It  was  found  12.64  c-c-  were  necessary  for  this 
purpose.  Hence  it  follows  that  193.2  mgms.  of  KOH  were  necessary 
for  the  neutralization  of  one  gram  of  the  mixture.  The  mean 
molecular  weight  is  found  by  dividing  56.1  by  that  found  necessary 
for  the  neutralization  of  one  gm.  of  oil. 
Let  M  be  the  molecular  weight  and  n  the  weight  of  KOH  in  gms. 
n 
now  n  =  a  X  0.0561  (a  number  of  c.c.'s  of  riormal  KOH). 
 ^1__=  jooo  _  jooo >  8 
a  X  0.0561  a  3.45 
3-33°3  gms.  of  oil  gave  2.5847  gms.  of  liquid  fatty  acid  by  the 
lead-salt-ether  process.  Therefore,  77  per  cent,  of  the  total  fatty 
acid  was  liquid  fatty  acid. 
It  was  found  that  the  oil  did  not  contain  any  stearic  acid. 
The  lactone  value  of  the  mixed  fatty  acid  was  the  difference 
between  the  saponification  and  neutralization  values,  .8. 
