^imbeMsST'}      Alcohol  in  Volumetric  Analysis.  671 
The  next  set  of  experiments  executed  were  made  with  a  view  of 
determining  the  amount  of  alkaline  solution  required  to  neutralize 
a  given  amount  of  f-^  acid  solution  in  50  cc.  of  water,  diluted 
commercial  alcohol  and  94.5  per  cent,  commercial  alcohol.  For 
ease  of  comparison,  the  writer's  results  are  given  on  the  basis  of 
centinormal  alkaline  solution.  The  results  given,  divided  by  two, 
equal  the  data  actually  obtained  by  the  writer.  The  results  are 
as  follows : 
Indicators. 
C.  Caspari. 
L.  F.  Kebler. 
Number  of  c.c.  of  _*L  alkaline 
100 
solution  required  to  neutral- 
ize 10  c.c.  of  _?L  acid  solution 
in  60  c.c.  of  the  following : 
Number  of  c.c.  of  T*jL  alkaline 
solution  required  to  neutral- 
ize 10  c.c.  of  *L  acid  solution 
in  50  c.c.  of  the  following  : 
Water. 
Diluted 
Commer- 
cial 
Alcohol. 
94-5  Per 
Cent.  Com- 
mercial 
Alcohol. 
Water. 
Diluted 
Commer- 
cial 
Alcohol. 
94-5  Per 
Cent.  Com- 
mercial 
Alcohol. 
98-57 
103-10 
106-28 
IOO* 
102* 
105-6 
98-52 
101-79 
104-07 
99-83 
101*2 
102-5 
Hematoxylin  .... 
98-17 
100-83 
103-15 
100* 
102*8 
106-8 
98-80 
ioo"4 
101-3 
101*6 
103-2 
104-5 
99*06 
101-13 
102-71 
99-6 
102* 
102*4 
98-66 
103-40 
106  32 
98-80 
IOI" 
102*9 
Methyl  orange  .... 
99-03 
IOO" 
93-2 
Phenolphthalein  .  . 
100*16* 
106-72 
109  24 
I02  "2 
104-4 
no* 
102* 
103-3 
106*7 
Tropseolin  OO  .... 
98-42 
96*11 
74*65 
IO0-5 
98*09 
95-6 
*  Caspari  standardized  his  solutions  by  means  of  phenolphthalein. 
The  above  results  conclusively  show  that  commercial  alcohol 
does  exert  a  disturbing  influence  in  volumetric  analysis  with  all 
the  indicators  employed. 
From  the  above  commercial  alcohol  a  purified  product  was  pre- 
pared. Four  litres  were  carefully  distilled  on  a  water  bath,  discarding 
the  first  and  the  last  200  c.c.  The  exit  tube  of  the  flask  was  pro- 
vided with  a  bulb,  such  as  is  used  in  Kjeldahl's  method  for  the  esti- 
mation of   nitrogen,  designed  especially  to  prevent  undesirable 
