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You dissolve 0.135 g of NaOH in 2.00 L of a buffer solution that has [H2PO4^-] = [HPO4^2-] = 0.104 M. What is the pH of the solution before adding NaOH? (Ka for dihydrogen phosphate ion is 6.2 x 10^-8.) What is the pH of the solution after adding NaOH?