EXP.  66. — Into  a  jar  of  Cl
plunge  a  lighted  pitch-wood
taper.  It  burns  awhile  with
smoky  flame.  The  Cl  unites
with  H  of  the  taper,  setting
the  C  free  as  smoke.  Test  by
blue  litmus.
EXP.  67.— Burn  a  jet  of  H
in  Cl  and  test  product  by  blue
litmus.
H  Cl  HClf


EXP.  68. — Into  a    iar  of  Cl

Fiij.  28.
introduce   a  piece  of    blotting

paper  moistened  with  frexh  and  warm  turpentine  (C10  H16).  The  Cl
unites  with  the  H  so  vigorously  as  to  cause  it  to  take  fire,  but  the  C
is  set  free  as  a  dense  cloud  of  smoke.
C10Hlt;    +    Cl,,;  16HC1    -|-    CN,

Test  by  litmus.
01  has  a  "great  affinity  for  H.  Upon  this  affinity
depends  its  value  as  a  disinfectant.  H  is  an  essential  con-
stituent of  many  foul  gases.  Cl  destroys  them  as  it
destroys  coloring  matters.  (See  EXP.  72).
EXP.  69. — Upon  paper  containing  printer's  ink  write  with  common
ink  (iron  tannate  Fe&C27HT,O17)  and  lower  into  a  jar  of  Cl. "  The

common  ink  is  bleached,  but  the  printer's  ink  (linseed  oil  and  lamp
black,  C)  is  unaffected.
EXP.  70. —  Into  a  black  bottle  containing  cold  water  pass  Cl  gas
(purified  of  H  Cl).  The  Cl  dissolves  (3  vols.)  and  forms  "chlorine
water. "  Set  aside  as  a  reagent.
72  CHEMICAL  PRIMER.
EXP.  71. — Expose  a  test  tube  of  chlorine  water  to  the  sunlight  for  a
few  hours.  Place  it  beside  a  test  tube  of  fresh  chlorine  water,  and  to
each  add  a  piece  of  blue  litmus  paper.  The  fresh  chlorine  water
bleaches,  the  other  turns  the  litmus  red.  The  light  enabled  the  Cl  to
decompose  the  water  thus: —

C12    +    H20     =     2HC1    +    O.
