You dissolve 0.191 g of NaOH in 2.00L of a buffer solution that has (H2PO,] = НРО %3D [HPO,*) 0.138 M. What is the pH of the solution before adding %3D NaOH? ( K, for dihydrogen phosphate ion is 6.2 x 10-.) pH = %3D What is the pH of the solution after adding NaOH? pH %3D

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