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AP Chemistry
8.7 pH and pKa
8.5 Acid-Base Titrations
IntermediateMCQGraphicalConceptual23k
A 2D line graph titled Titration of H2A with NaOH showing pH versus volume of titrant. The horizontal x-axis is labeled Volume of 0.10 M NaOH added (mL) with gridlines from 0 to 50 in increments of 10. The vertical y-axis is labeled pH with gridlines from 0 to 14 in increments of 2. A single solid black curve starts at (0, 2.0), passes through (10, 3.5), rises steeply through a vertical inflection at (20, 6.0), passes through (30, 7.2), rises steeply through a second vertical inflection at (40, 10.0), and levels off toward (50, 12.3). Points on the curve at x = 10, 20, 30, and 40 are marked with small solid black dots. No other curves, text, or annotations appear.
Titration curve for H2A titrated with 0.10 M NaOH.
A student titrates a sample of a weak diprotic acid, \(\text{H}_2\text{A}\), with \(0.10 \text{ M NaOH}\). The titration curve generated from the experimental data is shown below. Based on the titration curve, which of the following best identifies the value of \(pK_{a2}\) for \(\text{H}_2\text{A}\) and the reasoning used to determine it?

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