JACQUES LOEB 



93 



pH as ordinates. The curves represent these values for four acids, 

 HCl, H2SO4, H3PO4, and oxalic acid. Beginning with the lowest 

 curve we notice that the curve is the same for 0.1 n HCl and 0.1 N 

 H2SO4, since both are strong acids; or, in other words, H2SO4 combines 



19 

 18 



pn 2.0 22 24 26 2.8 aO 3.2 34 3.6 3.8 4.0 42 44 46 43 



Fig. 3. The ordinates represent the number of cc. of 0.1 N HCl, H2SO4, oxalic, 

 and phosphoric acids required to bring 1 gm. of isoelectric crystalline egg albumin 

 to the pH indicated on the axis of abscissae. Enough H2O was added to bring the 

 solutions of albumin and acid to a volume of 100 cc. For the same pH the ordi- 

 nates for HCl, H2SO4, and phosphoric acid are approximately as 1 : 1 : 3. The ratio 

 of HCl : oxahc acid is a little less than 1 : 2. 



