670 
Alcohol  in  Volumetric  Analysis. 
/Am.  Jour.  Pharm 
\  December,  1896. 
All  end-reactions  having  been  established,  the  indicators  were 
carefully  compared  with  one  another  in  water,  commercial  47  per 
cent,  alcohol  and  commercial  94-5  per  cent,  alcohol ;  25  c.c.  of  the 
respective  liquids  were  placed  into  a  beaker,  the  indicator  added, 
and  enough  fiftieth  normal  alkaline  or  tenth  normal  acid  solution 
added,  drop  by  drop,  until  the  desired  end-reaction  was  produced. 
For  ready  comparison,  Professor  Caspari's  results  of  analogous  mix- 
tures are  given  parallel  with  those  of  the  author.  They  are  as 
follows : 
C.  Caspari. 
I,.  F.  Kebler. 
The  amount  of  _*L  KOH  solu- 
The amount  of  *L  KOH  solu- 
7>  o 
tion  or 
H0SO4  solution  re- 
tion  or 
*L  H2S04  solution  re- 
Indicators. 
quired  to  produce  the  desired 
quired  to  produce  the  desired 
color  reaction  in  10  c.c.  of  the 
color  reaction  in  25  c.c.  of  the 
following : 
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. 
5  drops.* 
I*  c.c. 
i*6  c.c. 
0"I  c.c.f 
1  "4  c.c* 
2'6  c.c. 
0'2  c.c. 
o-8o  c.c. 
1 '4  c.c. 
0'2  C.C. 
I"  c.c. 
i'5  c.c 
Hematoxylin  .... 
1  drop. 
C65  c.c. 
1*25  c.c. 
O'l  c.c. 
1*5  c.c. 
2'9  c.c 
/  0-3  c.c. 
\  £  acid. 
1*3  c.c. 
n_  acid. 
i-8  c.c. 
*_acid. 
07  c.c. 
r'3  c.c. 
i'9  c.c. 
2  drops. 
0-45  c.c. 
07  c.c. 
O'l  cc. 
0*9  c.c. 
1*3  c.c. 
C  2  drops 
1  produced 
<  decided 
1  purple 
[blue. 
0'2  C.C  -  ) 
0-65  c.c.  j 
I'lO  c  c. 
O'l  c.c. 
07  c.c. 
i"6  c.c. 
Methyl  orange  .... 
r  1  drop  to 
J  O'l  cc. 
1*  acid. 
I'lO  c.c. 
To  acid- 
3""5  c.c. 
N_acid. 
0-3  c.c. 
T0acidl 
? 
? 
Phenolphthalein  .  .  . 
o"3  c.c. 
1  "9  c.c. 
4"  c.c. 
0*1  c.c. 
I'X  c.c. 
2*9  c.c. 
TropseolinOO  .  .  .  . 
r  1  drop  to 
J  0"I  c.c. 
1  N_  acid. 
no  c.c. 
TO  aCid- 
)  3"5  cc. 
}TN  acid. 
0"2  C.C. 
^.acid. 
? 
? 
*  When  not  specified,  the  |L  KOH  is  understood, 
t  o-i  c.c.  gave  about  two  drops. 
