Which of the following buffers would resist the most change if 0.10 M of HNO3 wa

Question

Which of the following buffers would resist the most change if 0.10 M of HNO3 was added? If 0.10 M NaOH added?
A. 0.10 M H3PO4/ 0.010 M KH2PO4
B. 0.10 M H3PO4/ 0.10 M KH2PO4
C. 0.010 M H3PO4/ 0.10 M KH2PO4
Which of the following buffers would resist the most change if 0.10 M of HNO3 was added? If 0.10 M NaOH added?
A. 0.10 M H3PO4/ 0.010 M KH2PO4
B. 0.10 M H3PO4/ 0.10 M KH2PO4
C. 0.010 M H3PO4/ 0.10 M KH2PO4

A. 0.10 M H3PO4/ 0.010 M KH2PO4
B. 0.10 M H3PO4/ 0.10 M KH2PO4
C. 0.010 M H3PO4/ 0.10 M KH2PO4

Explanation / Answer

The buffer solution whose pH = pKa , then that buffer solution has highest buffer capacity.

Among the given three options, B. 0.10 M H3PO4/ 0.10 M KH2PO4 has its pH equal to pKa.

pH = pKa + log(salt/acid)

if [salt] = [acid]

pH = pKa , which is a good buffer solution.

Answer = B. 0.10 M H3PO4/ 0.10 M KH2PO4

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