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Calculate the amounts of Na2HPO4 and NaH2PO4 (in grams) needed to prepare 200 mL of a buffer with pH = 8.25 so that the sum of concentrations of HPO42- and H2PO4- ions is 0.5 M. ?pKa1 =2.12, pKa2 = 7.21, pKa3 = 12.38 ?[Na2HPO4 MW = 141.96g/mol] [NaH2PO4 MW = 119.96 g/mol]

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