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AP Chemistry
8.10 Buffer Capacity
8.8 Properties of Buffers
8.5 Acid-Base Titrations
IntermediateMCQMathematicalConceptual19.3k
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.

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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