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Values of pK, AH°, and AS°valid at 25°and zero ionic strength are reported for proton ionization from protonated adenosine and for the consecutive ionization of two protons from protonated adenine (AH°a nd AS0 values only) inosine, xanthine, and xanthosine, and three protons from protonated guanosine and protonated hypoxanthine. The AS°values are generally of the magnitudes expected for the charge types involved in the reactions. ThermodynamicIn previous papers of this series a calorimetric titration procedure was used to identify sites of proton ionization from adenosine (Izatt et al., 1965(Izatt et al., , 1966 and pyrimidines (Christensen et al., 1967b) and to determine the pK, AH°, and 5°values associated with proton ionization from several components of nucleic acids, i.e., purines (Christensen and

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