Use the following pKa values of phosphoric acid H3PO4: pka1 = 2.15 pka2 = 7.2 pka3 = 12.4 Assume 0.2 mol of Na3PO4 and 0.5 mol of Na2HPO4 are dissolved in 1 Liter of water. Part A. What is the pH of this solution ?

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