358 
Syrup  of  Hypophosphites  with  Iron. 
f  Am.  Jour.  Pharm. 
\       July,  1884. 
Py  being  the  symbol  for  the  radical  of  hypophosphorous  acid  and 
Ci  the  symbol  for  the  radical  of  citric  acid. 
By  careful  evaporation  the  liquid  may  be  reduced  to  a  syrupy  con- 
sistence, and  after  pouring  on  a  glass  or  porcelain  tile  the  product  may 
be  obtained  in  thin  soluble  scales  having  an  acidulous  taste.  But  if 
one  equivalent  of  ferric  citrate  be  treated  in  solution  with  two 
equivalents  of  sodium  hypophosphite,  a  somewhat  lighter  green  solution 
than  the  foregoing  results  containing  a  very  soluble  amorphous  com- 
pound, wrhich  though  deliquescent  may  be  obtained  in  scales  and  is 
represented  thus : 
Fe  =  Py2 
I  (2) 
Ci  =  Na2 
It  is  also  found  by  experiment  that  ferric  hypophosphite  is  soluble 
in  potassium  citrate,  each  equivalent  of  the  hypophosphite  requiring 
an  equivalent  of  the  citrate  for  solution.  This  solution  is  shown  on 
evaporating  to  contain  a  mixture  of  crystals  of  potassium  hypophosphite 
and  a  green  colored  crystalline  compound.  This  mixture  may  be 
obtained  by  the  inverse  process,  treating  a  solution  of  one  equi  valent  of 
ferric  citrate  with  three  equivalents  of  potassium  hypophosphite.  But 
if  one  equivalent  of  ferric  citrate  be  dissolved  in  a  solution  of  one 
equivalent  of  potassium  hypophosphite  the  solution  becomes  olive 
green  in  color,  and  contains  a  non-deliquescent,  but  very  soluble  scale 
compound  which  is  represented  thus : 
Fe  — Py 
II  (3) 
Ci  — K. 
If  one  equivalent  of  ferric  citrate  be  treated  in  solution  with  two 
equivalents  of  potassium  hypophosphite,  an  olive  green  crystalline 
compound  is  formed  which  though  quite  soluble  is  not  as  freely  so  as 
the  last,   This  crystalline  compound  may  be  represented  thus  : 
Fe  =  Py2 
I  (4) 
Ci  =  K2 
Again,  if  one  equivalent  of  ferric  citrate  be  united  with  one  equivalent 
of  calcium  hypophosphite,  the  resulting  grass-green  solution  on  con- 
centration yields  an  amorphous  compound,  capable  of  being  scaled  and 
is  represented  by  the  formula  : 
