Acids & Bases Problem Set

Question 11: pH and buffering capacity of a mixed solution

If equal volumes of 0.05 M NaH₂PO₄ and 0.05 M H₃PO₄ are mixed, which of the following best describes the resulting solution? (pK_a's for phosphoric acid are 2.0, 6.8 and 12.0)

A.	pH 2 and poorly buffered.
B.	pH 2 and well buffered.
C.	pH 6.8 and well buffered.
D.	pH 12 and well buffered.
E.	pH 6.8 and poorly buffered.