66      KEMOVAL  OF  NITRIC  ACID  FROM  SULPHURIC  ACID,  ETC. 
An  effervescent  citrate  may  be  made  according  to  the  follow- 
ing formula  : 
Take  of  Citric  acid,  gvij. 
Carb.  magnesia,  ^iij. 
Mix  intimately  and  expose  in  a  warm,  moist  atmosphere  till 
all  reaction  has  ceased.    Dry,  and  by  trituration  and  sifting  re- 
duce to  a  granular  powder,  then  take  of  this 
Acid  cit.  magnesia,  one  troyounce. 
Granulated  sugar,  half  " 
(Flavored  with  oil  of  lemon.) 
Bicarb,  soda  (dried  at  a  heat  under  212°)  100  grs.  Mix. 
The  granulated  form  of  this  preparation  is  handsomer  in  ap- 
pearance and  probably  more  permanent,  but  the  powdered  is  to 
be  preferred,  nevertheless,  on  account  chiefly  of  its  readier  solu- 
bility.   The  writer  has  tried  the  process  of  M.  Morelli,  published 
in  the  last  number  of  our  Journal  of  Pharmacy,  (July  No.,  1866,) 
and  finds  it  to  yield  a  salt  of  readier  solubility  than  any  he  has 
yet  tried.    The  following  formula  is  based  on  this  process  : 
Take  of  Citric  Acid,  3vij. 
Carb.  magnesia,  giij. 
Water  f^iiss. 
Pulverize  the  citric  acid,  add  the  water  and  then  incorporate 
the  carb.  magnesia.     The  mass  should  be  stirred  frequently 
during  the  reaction  ;  when  dried  and  pulverized,  add  to  each 
troyounce^ 
Pulv.  sugar  (flavored  with  oil  of  lemon,)  ^ss. 
Bicarb,  soda  (dry,)  100  grs.  Mix. 
Chicago,  111,  1866.  —Proc.  Am.  Pharm.  Ass.  1866. 
REMOVAL  OF  NITRIC  ACID  FROM  SULPHURIC  ACID  BY 
CHARCOAL. 
By  William  Skey,  Analyst  to  the  Geological  Survey,  New  Zealand. 
♦  In  certain  analytical  operations,  also  for  voltaic  batteries,  it  is 
sometimes  necessary  to  use  sulphuric  acid  which  is  uncontamin- 
ated  with  nitric  acid  ;  but  their  separation  hitherto  has  been  a 
matter  of  difficulty,  only  attained  by  methods  of  a  very  pro- 
tracted nature. 
