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AP Chemistry
8.10 Buffer Capacity
8.9 Henderson-Hasselbalch Equation
8.8 Properties of Buffers
AdvancedMCQProportional AnalysisConceptual18.2k
A student prepares two buffer solutions at \(25^\circ\text{C}\) by dissolving \(\text{CH}_3\text{COOH}\) (\(\text{p}K_a = 4.74\)) and \(\text{CH}_3\text{COONa}\) in distilled water, as summarized in the table below.

BufferVolume\([\text{CH}_3\text{COOH}]\)\([\text{CH}_3\text{COO}^-]\)Initial \(\text{pH}\)
\(\text{X}\)\(100.0\text{ mL}\)\(0.50\text{ M}\)\(0.50\text{ M}\)\(4.74\)
\(\text{Y}\)\(100.0\text{ mL}\)\(0.050\text{ M}\)\(0.050\text{ M}\)\(4.74\)

The student adds \(1.0\text{ mL}\) of \(1.0\text{ M HCl(aq)}\) to each buffer solution. Which of the following correctly identifies the buffer that will experience the smaller change in \(\text{pH}\), and provides the correct justification?

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