602 



COLLOIDAL BEHAVIOR OF EDESTIN 



O 

 u 

 o 



.9 



.S 

 -♦-' 



CO 



«CiJB 

 m 

 ^. 

 o 



5 



I 



8 



O 

 O 



O 



pH 1.5 



20 2.5 3.0 3.5 4.0 ■ 4.5 



Fig. 2. Amounts of 0.1 n acid combined with 0.45 gm. edestin in 100 cc. Values 

 for HCl, H2SO4, and HaCjO* obtained by difference between titration curves with 

 and without protein. Values for H3PO4 obtained by calculation, as in Fig. 1, IV. 



TABLE I. 



Ratios of Amounts of Different Acids Combined with Edestin at Corresponding pH 



Values. 



Attempts were made to carry these curves farther into the region of 

 lower pH, but since they are obtained from differences between the 

 ordinates of steep curves like I and II in Fig. 1, the errors become too 



