AP Chemistry
8.9 Henderson-Hasselbalch Equation
8.4 Acid-Base Reactions and Buffers
A student prepares a buffer solution by mixing \(50.0\text{ mL}\) of \(0.10\text{ M HNO}_2\text{(aq)}\) with \(50.0\text{ mL}\) of \(1.0\text{ M NaNO}_2\text{(aq)}\) at \(25\ ^\circ\text{C}\). Given that the \(K_a\) of \(\text{HNO}_2\) is \(4.0 \times 10^{-4}\) (\(\text{p}K_a = 3.40\)) at \(25\ ^\circ\text{C}\), what is the \(\text{pH}\) of the resulting buffer solution?
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