AP Chemistry
8.10 Buffer Capacity
8.8 Properties of Buffers
8.5 Acid-Base Titrations
A student titrates a \(25.0\text{ mL}\) sample of a weak monoprotic acid, \(\text{HA(aq)}\), with \(0.100\text{ M NaOH(aq)}\). The \(\text{pH}\) of the mixture is measured after successive additions of titrant, as shown in the table below.
Based on the data in the table, which of the following identifies the volume of \(\text{NaOH(aq)}\) added at which the solution exhibits its maximum buffering capacity, along with the correct justification?
| Volume of \(0.100\text{ M NaOH}\) added (mL) | \(\text{pH}\) |
|---|---|
| \(0.0\) | \(2.88\) |
| \(6.0\) | \(4.38\) |
| \(12.0\) | \(4.76\) |
| \(18.0\) | \(5.24\) |
| \(23.0\) | \(5.85\) |
| \(24.0\) | \(8.80\) |
| \(25.0\) | \(11.60\) |
| \(30.0\) | \(12.30\) |
Based on the data in the table, which of the following identifies the volume of \(\text{NaOH(aq)}\) added at which the solution exhibits its maximum buffering capacity, along with the correct justification?
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