THE  AMERICAN 
JOURNAL  OF  PHARMACY. 
OCTOBER,  1880. 
ACID  PHOSPHATES. 
(*'  Liquor  Acidi  Phosphorici,"  "Liquor  Acidi  Phosphorici  Comp.") 
By  James  T.  Shinn. 
In  the  Philadelphia  ^''Medical  Times,"  Aug.  14th,  1880,  is  a  paper 
by  Dr.  Wm.  Pepper  on  the  administration  of  Phosphoric  Acid,  in 
which  the  use  of  Horsford's  Acid  Phosphates  is  spoken  of  and  its 
stated  composition  given,  and  two  other  preparations,  with  titles  as 
above,  are  recommended  as  worthy  of  extended  trial.  Their  com- 
ponent parts  are  mentioned,  but  not  the  manipulation  in  preparing  them. 
The  formulas  are  as  follows: 
Liquor  Acidi  Phosphorici  (without  Iron). 
R        Calcii  phosphat.,  grs.  iii  5  or  for  Oi,  384  grains. 
Magnesii  phosphat.,  grs.  ii  ;  "  256 
Potassii  phosphat.,  grs.  iss  j  *'  192 
Syrupy  phosphoric  acid,  n\,v  5  *'       64.0  minims. 
Aquae,  q.  s.  fr.  f^i  j  *'       i  pint. 
Liquor  Acidi  Phosphorici  Comp.  (with  Iron). 
R        Calcii  phosphat.,  grs.  iii ;  or  for  Oi,  384  grains. 
Magnesii  phosphat.,  gr.  ss  j  "64 
Potassii  phosphat.,  gr.   4^5  "  32 
Ferri  phosphat.,  gr.  ss  j  '*  64 
Syrupy  phos.  acid,  1^  vi  f  5  **      816  minims 
Aquae,  q.  s.  ft.  f3i  j  "      1  pint 
The  syrupy  phosphoric  acid  used  contains  about  60  per  cent,  of 
glacial  acid,  and  is  furnished  by  the  chemists  and  druggists  for  manu- 
facturing purposes. 
As  some  pharmacists  may  have  calls  for  the  preparations  in  limited 
quantities  and  might  not  have  all  the  phosphates  in  stock,  a  ready  pro- 
cess by  which  they  can  be  made  in  any  apothecary  shop  is  desirable. 
The  bone  phosphate  of  lime  is  not  entirely  soluble  in  phosphoric  acid, 
and  can  readily  be  made  from  the  carbonate:  in  156  parts  are  72  parts 
phosphoric  acid  and  84  parts  lime,  which  latter  are  equivalent  to  150 
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