Strontium  Chloride,  SrCl2.6H20. — ^The  readiest  method  of  preparing  this
salt  is  by  saturating  hydrochloric  acid  with  the  native  carbonate  and  digest-
ing the  solution  for  some  time  with  excess  of  carbonate,  by  which  metals
like  aluminum,  iron,  and  manganese  are  removed.  The  hot  concentrated
solution  deposits,  on  cooling,  acicular  crystals  of  the  hexagonal  system.
These  crystals  have  a  sharp,  bitterish  taste,  and  deliquesce  on  exposure
to  the  air.  They  are  soluble  in  1.8  parts  of  water  at  ordinary  tempeia-
tures,  and  in  0.9  part  of  boiling  water;  soluble  in  alcohol.
372  CHEMISTRY  OF  THE  METALS.
On  the  application  of  heat  the  salt  loses  its  water  of  crystallization  at
100°,  and  at  829°  it  melts.  The  anhydrotis  salt  is  said  to  be  insoluble
in  absolute  alcohol.
Strontium  Bromide,  SrBr^.bHjO.  Strontii  Bromidum,  U.S.P. —
On  saturating  hydrobromic  acid  with  strontium  carbonate  the  bromide
results,  as  follows:  f       '  '        ^  ^  U  t^v  -^  ^'  ''^

SrCOs     -i      aHBr     -      SrBra     -f     HaO     -f     CO2.
