Problem: What is the pH of a 500 mL buffer containing 0.10 M Na 2HPO4/0.15 M KH2PO4 after adding 19 mL of 1 M NaOH?

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What is the pH of a 500 mL buffer containing 0.10 M Na 2HPO4/0.15 M KH2POafter adding 19 mL of 1 M NaOH?

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