474  Alcohol  in  Titration  of  Alkaloids.  {^pfe0mber,hS' 
10  c.c.  diluted  alcohol  required  0*65  c.c.  T^  KOH  sol.  to  produce  the  same 
purple  color,  which  was  again  destroyed  upon  addition  of'  a  few  drops  of 
alcohol. 
10  c.c.  alcohol  required  1*25  c.c.  KOH  sol.  to  show  a  decided  alkaline 
reaction. 
10  c.c.  absolute  alcohol  ;  a  purple  color  was  produced  within  one  minute  by 
the  indicator  alone,  without  the  addition  of  any  alkali.  The  color,  how- 
ever, disappeared  upon  addition  of  a  trace  of  decinormal  acid. 
Cochineal  solution,  10  gm.  to  100  c.c.  25  per  cent,  alcohol.    Five  drops  were 
used  for  each  experiment. 
10  c.c.  distilled  water  required  6  drops  (about  0*2  c.c.)  Tf5  KOH  sol.  for  a 
decided  alkaline  reaction,  indicated  by  a  purplish-red  (onion-red)  color. 
10  c.c.  diluted  alcohol  required  o*8o  c.c.  x£ ^  KOH  sol.  to  produce  the  same 
color,  which  was  again  destroyed  by  a  few  drops  of  alcohol. 
10  c.c.  alcohol  required  1*4  c.c.        KOH  sol.  to  produce  the  same  color. 
10  c.c.  absolute  alcohol  required  o-i  c.c.        KOH  sol.  to  show  the  alkaline 
reaction. 
Brazil-wood  solution  (U.  S.  P.  test  solution),  10  gm.  to  20  c.c.  water,  with 
subsequent  addition  of  2  c.c.  alcohol.  Ten  drops  were  used  for  each 
experiment. 
10  c.c.  distilled  water  required  5  drops  x£q  KOH  sol.  to  produce  the  pink  color 
indicating  alkalinity. 
10  c.c.  diluted  alcohol  required  ro  c.c,  TfT  KOH  sol.  to  produce  the  same 
color,  which  was  again  destroyed  by  a  few  drops  of  alcohol. 
10  c.c.  alcohol  required  i*6  c.c.       KOH  sol.  to  show  the  alkaline  reaction. 
10  c.c.  absolute  alcohol  required  0*25  c.c.  T£o  KOH  sol.  to  produce  the  desired 
pink  color. 
Lacmoid  solution,  1  gm.  to  500  c.c.  50  per  cent,  alcohol.  Ten  drops  were  used 
for  each  experiment. 
10  c.c.  distilled  water  required  2  drops  T^  KOH  sol.  to  produce  a  decided  pur- 
plish-blue color. 
10  c.c.  diluted  alcohol  required  0*45  c.c.  KOH  sol.  to  produce  the  same 
color,  which  was  again  destroyed  by  a  few  drops  of  alcohol. 
10  c.c.  alcohol  required  07  c.c.  T^  KOH  sol.  In  this  case  the  purplish-blue 
color  produced  was  discharged  by  a  large  excess  of  alkali. 
10  c.c.  absolute  alcohol.  A  decided  blue  color  was  produced  by  the  indicator 
alone,  which  was  not  changed  by  addition  of  an  excess  of  alkali. 
Litmus  solution  (aqueous  solution).    Four  drops  were  used  for  each  experi- 
ment. 
a.  10  c.c.  distilled  water  ;  a  purplish-red  color  was  produced  by  the  indicator 
alone. 
