AP Chemistry
8.9 Henderson-Hasselbalch Equation
8.8 Properties of Buffers
8.4 Acid-Base Reactions and Buffers
A student tests the response of a water-quality calibration buffer to added strong base. The buffer and added solution have the following properties at \(25^\circ\text{C}\).
For \(\text{NH}_4^+\text{(aq)}\), \(pK_a=9.25\). Assume that the volumes are additive and that \(\log 2=0.30\). What is the pH of the solution after the solutions are mixed?
| Solution | Volume | Solute concentrations |
|---|---|---|
| Buffer | \(50.0\text{ mL}\) | \(0.100\text{ M NH}_3\) and \(0.500\text{ M NH}_4\text{Cl}\) |
| Added solution | \(50.0\text{ mL}\) | \(0.100\text{ M NaOH}\) |
For \(\text{NH}_4^+\text{(aq)}\), \(pK_a=9.25\). Assume that the volumes are additive and that \(\log 2=0.30\). What is the pH of the solution after the solutions are mixed?
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