248  Barium  in  Kanawha  Salt. 
The  filtered  solution  of  salt  was  precipitated  with  carbonate  of  sodium^ 
the  thoroughly  washed  precipitate,  dissolved  in  hydrochloric  acid,  the 
solution  evaporated  to  dryness,  and  the  remnant  heated  in  a  platinum 
crucible  for  a  long  time,  but  not  to  fusion.  After  cooling,  the  mass 
was  rubbed  to  a  fine  powder,  introduced  into  a  dry  bottle  and  about  20 
to  24  parts  of  absolute  alcohol  added. 
After  two  days'  maceration  under  frequent  agitation,  the  undissolved 
portion  was  collected  on  filter,  repeatedly  washed  with  absolute  alcohol 
and  then  dried.  By  dissolving  it  in  water  a  small  remnant  was  left  on 
filter  consisting  of  magnesia  and  sesquioxide  of  iron.  The  clear  watery 
solution  contained  chloride  of  barium  ;  it  gave  with  chromate  of  potas- 
sium a  pale-yellow  precipitate,  with  hydrofluosilicic  acid  a  crystalline 
white  precipitate,  and  in  very  dilute  solution  with  sulphuric  acid  a  white 
precipitate,  insoluble  in  acid. 
The  alcoholic  solution  burned  with  the  reddish-yellow  flame  peculiar 
to  lime,  without  showing  the  least  carmine-red  color  characteristic  for 
strontia.  Evaporated  to  dryness  to  drive  off  the  alcohol  and  then  dis~ 
solved  in  water,  the  watery  solution  contained  lime,  magnesia  and  iron^ 
and  besides  a  trace  of  barytes,  as  the  acidulated  solution  produced  with 
sulphate  of  calcium  solution  a  slight  turbidity.  As  chloride  of  barium 
is  not  entirely  insoluble  in  alcohol,  this  trace  of  it  in  alcoholic  solution 
is  easily  accounted  for.  My  intention  being  only  to  prove  the  presence 
of  barytes  (or  strontia,  if  present),  I  did  not  make  a  complete  analysis. 
The  barium  chloride  obtained  in  the  above  way  being  considerable^ 
I  determined  its  quantity  by  precipitating  the  filtered  salt  solution^ 
strongly  acidulated  with  hydrochloric  acid,  with  solution  of  sulphate  of 
calcium,  washing,  drying  and  weighing  the  precipitate. 
In  this  way  from  i8'325  salt  were  obtained,  0'68o  sulphate  of  barium^ 
corresponding  to  0'6o65  dry  chloride  of  barium,  or  0'7ii5  crystallized 
barium  chloride,  which  latter  amount  represents  3*88  per  cent.  Finding 
so  large  an  amount  of  barium  chloride  in  the  barrel  from  which  the 
sample  was  taken  for  examination,  I  examined  the  balance  of  the  bar- 
rels on  hand  and  found  some  that  did  not  contain  any  barytes  at  all,  as. 
the  solution  remained  entirely  clear  on  addition  of  sulphate  of  calcium^ 
one  barrel  contained  only  traces,  and  another  one  again  gave  consider- 
able precipitate  with  calcium  sulphate. 
Chloride  of  barium  is  much  more  soluble  in  boiling  water  than  chlo- 
ride of  sodium,  and  therefore,  the  circumstance  that  some  salt  is  en- 
tirely free  of  barium  chloride,  while  another  one  contains  a  great  deal. 
