CORRECTNESS OF THE CHEMICAL VIEWPOINT 51 



It is again obvious that the curves for HC1 and H 2 SO 4 are 

 practically identical while the ordinates of the curve for H 3 PO 4 



20 

 19 

 18 

 17 

 16 

 15 

 14 

 13 

 12 

 11 

 10 



2.0 22 .4 2.6 2.8 3.0 3.Z 3.4 3.6 3.6 4.0 4.2 44 4.6 



FIG. 8. Combination curve of acids with gelatin, confirming the stoichio- 

 metrical character of the combination. 



are approximately three and those for oxalic acid about twice as 

 high as those for HC1 or H 2 SO 4 for the same pH, as long as the 

 pH is below 3.2; while above 3.2 the curve for oxalic acid deviates 



