AP Chemistry
8.10 Buffer Capacity
8.9 Henderson-Hasselbalch Equation
8.8 Properties of Buffers
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.
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?
| Buffer | Volume | \([\text{CH}_3\text{COOH}]\) | \([\text{CH}_3\text{COO}^-]\) | 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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