DAVID I. HITCHCOCK 



603. 



great, as the experimental error in the pH determination is about 

 ± 0.02 pH. 



I 



CO 



B 



O 



B 



O 



o 



u 

 U 



pH 9 



10 



11 



12 



13 



Fig. 3. Titration curve of 0.45 per cent edestin with 0.1 n NaOH and Ba(OH),. 



Fig. 3 represents the titration of 0.45 per cent edestin solutions 

 with 0.1 N NaOH and Ba(0H)2. The curve is the original titration 

 curve, and does not represent the amount of alkali combined with the 

 edestin. However, since the points fall on one curve, it seems fairly 



