92 Conductivities and Viscosities in Pure and in Mixed Solvents. 



We obtained the following results: 



Ammonia and phenolphthalein: 



10 c.c. standard acid in presence of the ester 19.3 c.c. of base used. 



10 c.c. standard acid 16.3 c.c. of base. 

 Sodium hydroxide and phenolphthalein: 



5 c.c. H 2 SO4, strength unknown in presence of the ester 16.8 c.c. of base used. 



5 c.c. H-2SO 4 , strength unknown 13.60 c.c. of base. 

 Ammonia and methyl orange: 



5 c.c. standard acid in presence of the ester 7.8 c.c. of base used. 



5 c.c. standard acid 7.82 c.c. of base. 

 Sodium hydroxide and methyl orange: 



5 c.c. standard acid in presence of the ester 12.60 c.c. of base used. 



5 c.c. standard acid 12.55 c.c. of base. 

 Sodium hydroxide and methyl orange: 



5 c.c. H 2 SO4, strength unknown in presence of the ester 14.5 c.c. of base used. 



5 c.c. H 2 SO 4 , strength unknown 13.5 c.c. of base. 

 Ammonia and methyl orange: 



5 c.c. H 2 SO4, strength unknown in presence of the ester 8.7 c.c. of base used. 



5 c.c. H 2 SO 4 , strength unknown 8.6 c.c. of base. 

 Ammonia and phenolphthalein: 



5 c.c. H 2 SO 4 , strength unknown in presence of the ester 9.4 c.c. of base used. 



5 c.c. H 2 SO 4 , strength unknown 9.1 c.c. of base. 



Thus far, ammonia and methyl orange gave the best results. With 

 sodium hydroxide the color of the indictaor rapidly disappears on 

 standing, due probably to saponification of the eter. Barium hydrox- 

 ide has frequently been used for this purpose; therefore we tried this 

 base. 



Barium hydroxide and phenolphthalein: 



5 c.c. H 2 SO 4 , strength unknown in presence of the ester 6.0 c.c. of base used. 



5 c.c. H 2 SO 4 , strength unknown 5.8 c.c. of base. 

 Barium hydroxide and methyl orange: 



5 c.c. H 2 SO 4 , strength unknown in presence of the ester 5.8 c.c. of base used. 



5 c.c. H 2 SO 4 , strength unknown 5.7 c.c. of base. 



The color of the indicator did not persist with barium hydroxide. 

 Therefore, we discarded this in favor of ammonium hydroxide. As 

 regards acetic acid, methyl orange is the only common indicator that 

 can be used. 



Ammonia and methyl orange: 



10 c.c. acetic acid, strength unknown in presence of ester 0.2 c.c. of base used. 

 10 c.c. acetic acid, strength unknown 0.1 c.c. of base. 



Methyl orange is of little value, since we should have obtained 

 readings of about 8 or 10 c.c. Morse suggests carollin, since this is a 

 good indicator with organic acids. 1 



Ammonia and corallin: 



10 c.c. acetic acid, strength unknown in presence of ester 

 9.0 c.c. base used. 



9.0 c.c. base used. 



10 c.c. acetic acid, strength unknown 



9.1 c.c. of base. 

 9.1 c.c. of base. 



: Exercises in Quant. Chem., 289; Glaser: Indikatoren, 92. 



