II. CHEMISTRY 



471 



2400 



2800 



2500 2600 2700 



Wavelength A 



Fig. 5 i Ultraviolet absorption spectra of nicotinamide at various pH values. 

 (From Jellinek and Wayne.") 



-2 



pK 1 = 10.60 



pK„= 13.50 



Experimental points o 

 Calculated curve — 



2 

 pH 



Fig. 6. Dissociation curve for nicotinamide at X = 2615 A. (From Jellinek and 



Wavne.") 



