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what is the pH of a buffered sysem made by dissolving 17.42 g of KH2PO4 and 20.41 g of K2HPO4 in water to give a volume of 200.0 mL? The Ka2 for dihydrogen phosphate is 6.2 X 10^-8 and the equilibrium reaction of interest is

H2PO4-(aq) + H2O(l) = H3O+(aq) + HPO4-(aq)

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