A buffer solution is prepared by dissolving 0200 mol of, Chemistry

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A buffer solution is prepared by dissolving 0200 mol of

A buffer solution is prepared by dissolving 0.200 mol of NaH2PO4 and 0.100 mol of NaOH in enough water to make 1.00 L of solution. What is the pH of the H2PO4- / HPO42- buffer if the Ka2 = 6.2 * 10^-8

A) 7.71

B) 7.21

C) 7.51

D) 6.91

The correct answer is B) 7.21. Please explain how it is 7.21. I know pKa is 7.21, but I don't fully understand the steps of this question.

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Chemistry: A buffer solution is prepared by dissolving 0200 mol of

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