Biochemistry at The Biology Project

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? (pKa'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.

[Problem 10] [Tutorial]

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