396  Absorption  of  Ozone  by  Water.  {^ftw?*' 
6.  If  the  treatment  be  unsuccessful,  this  should  not  be  charged  to 
the  koussin,  but  rather  to  casual  circumstances  which  counteract, 
more  or  less,  the  effects  of  this  remedy. 
ON  THE  ABSORPTION  OF  OZONE  BY  WATER. 
By  L.  Carids.* 
The  author  prepared  ozone  according  to  Soret's  method, f  by  elec- 
trolysis of  cold  diluted  sulphuric  acid,  using  wires  of  platin-iridium  as 
■electrodes.  The  absorbing  water  was  kept  at  a  temperature  of  be- 
tween 0-5  and  3°  C,  the  current  of  gas  was  continued  for  two  or 
three  hours,  and  the  unabsorbed  gas  carefully  removed.  This  ozon- 
ized water  was  then  examined,  with  the  following  results  : 
1.  It  had,  unmistakably,  a  strong  characteristic  odor  of  ozone. 
2.  It  became  brown-yellow  from  liberated  iodine  on  the  addition  of 
iodide  of  potassium  solution,  and  the  further  addition  of  starch  solu- 
tion caused  a  blue  color,  and  after  awhile  a  bulky  blue  sediment.  If 
ozone  water  was  added  to  a  solution  of  iodide  of  potassium  and  starch, 
the  blue  color  at  first  produced  would  disappear  on  the  further  addi- 
tion of  ozone  water,  owing  to  the  oxidation  of  iodine  to  iodic  acid : 
for  the  same  reason,  an  aqueous  solution  of  iodine  is  decolorized  by 
ozone  water. 
A  solution  of  protoxide  of  thallium  added  to  ozone  water  in  a 
■closed  vessel,  separates,  after  some  time,  brown  flocculent  peroxide  of 
thallium. 
Ozone  water  decolorizes,  energetically,  indigo  and  litmus,  and  col- 
ors tincture  of  guaiacum  deep  blue. 
3.  Ozone  water  exposed  to  the  air  soon  loses  its  odor  and  action 
upon  the  reagents  mentioned  before  ;  and  if  air  is  passed  through  the 
solution,  the  ozone  completely  disappears,  the  displaced  gas  showing 
the  presence  of  ozone  by  the  proper  reagents. 
On  bringing  silver  leaf  in  contact  with  ozone  water,  the  appear- 
ance of  peroxide  of  silver  was  repeatedly  observed,  but  its  formation 
seems  to  be  depending  upon  certain  favorable  conditions. 
The  absence  of  nitrous  (oxidized  to  nitric)  acid  was  proven  by  its 
perfect  neutrality  to  litmus  paper  after  the  ozone  water  had  been 
*  Abridged  from  Berichte  d.  d.  Chem.  Gesellsch.  zu  Berlin,  1872,  No.  11,  p. 
520—526. 
f  Comptes  Rendus,  lvi,  390. 
