^Msipt.Bi,m2RM  }       Ozone  in  a  Concentrated  State.  409 
into  ozone,  is  decomposed  and  becomes  of  a.  reddish-brown  color, 
through  the  liberation  of  iodine  (Schonbein).  Free  potassa  is  also 
formed  (A.  H.)  The  reaction  is  rendered  more  striking  if,  for  a  sim- 
ple solution  of  iodide  of  potassium,  we  substitute  a  colorless  mixture 
composed  of  4  to  6  cubic  centimetres  of  a  neutral  solution  of  iodide 
(6  to  100),  and  two  c.c.  of  the  dilute  sulphuric  acid  containing  0-122 
grammes  S03.HO.  The  liquid  colors  slightly  and  nearly  the  whole 
of  the  iodine  is  precipitated. 
Hydrochloric  Acid. — 5  c.c.  of  pure  colorless  solution  of  hydro- 
chloric acid  in  water,  holding  in  suspension  finely  divided  gold  leaf, 
when  agitated  for  two  minutes  with  concentrated  ozone,  becomes  of  a 
yellow  color,  the  metal  is  entirely  dissolved,  and  at  the  same  time  a 
manifest  odor  of  chlorine  is  produced  (A.  H.) 
Ammonia. — A  few  cubic  centimetres  of  the  volatile  alkali,  turned 
into  a  half-litre  flask  of  ozone,  emitted  white  vapors  consisting  of 
nitrate  and  nitrite  of  ammonia  (A.  H.)  A  transparent  mixture  of 
ozone  and  dry  gaseous  ammonia  nitrifies  when  water  is  introduced 
(A.  H.) 
Sulphuretted  Hydrogen. — A  strong  reaction,  sulphur  deposited,  and 
white  vapors  produced. 
Phosphuretted  Hydrogen. — (PH3  of  M.  Thenard.)  This  gas,  which 
is  unaffected  by  ordinary  oxygen,  burns  with  a  vivid  light  in  contact 
with  ozone.  The  experiment  may  be  made  without  danger,  if  only 
one  c.c.  of  gas  is  used  over  water  in  a  tube  several  decimetres  long. 
As  each  bubble  of  ozone  is  introduced  a  brilliant  flash  of  light  appears 
<A.  II.) 
A  mixture,  composed  of  2  volumes  of  phosphuretted  hydrogen  (not 
spontaneously  inflammable),  and  1  volume  of  oxygen,  blown  into  a 
soap-bubble,  detonates  with  violence  on  contact  with  a  globule  of 
ozone).    The  ozone  acts  as  though  it  were  charged  with  electricity. 
Organic  Matters. — Ozone  rapidly  corrodes  caoutchouc,  whether 
vulcanized  or  not  (Fremy  and  Becquerel).  A  current  of  ozone  made 
to  pass  through  a  tube  filled  with  fragments  of  caoutchouc,  becomes 
charged  with  carbonic  acid,  and  produces  a  precipitate  with  baryta 
water  (A.  H.)  The  alteration  of  caoutchouc  by  ozone  is,  therefore, 
the  result  of  a  combustion.  Solution  of  aniline-red  is  instantly 
bleached  by  ozone ;  a  weak  solution  of  indigo  is  likewise  decolorized. 
— Amer.  Chem.,  June,  1872,  from  Mech.  Mag. 
