Effect of ionic strength on pKa. Ka for the H2PO4- /HPO24- buffer is

If you mix a 1:1 mole ratio of H2PO-4 and HPO42- at 0 ionic strength, the pH is 7.20. Using activity coefficients from Table 7-1, calculate the pH of a 1:1 mixture of H2PO-4 and HPO24- 2 at an ionic strength of 0.10. Remember that pH = - logAH = - log [H+] γH.

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HPOİ 10 Ka = [H.POx]านวุโ04