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A buffer solution is made by adding 75.52 mL of 1.00 M phosphoric acid (H3PO4, pKa...

A buffer solution is made by adding 75.52 mL of 1.00 M phosphoric acid (H3PO4, pKa = 2.12) with 10.00 mL of 1.00 M sodium dihydrogen phosphate (NaH2PO4, pKa = 7.21). What is the pH of the buffer solution?   
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