A Buffer Solution Is Prepared by Dissolving 0

question 109

Multiple Choice

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^-/HPO₄^2- buffer if the K_a2 = 6.2 × 10^-8?

• A)6.91
• B)7.21
• C)7.51
• D)7.71

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