AP Chemistry
8.8 Properties of Buffers
8.4 Acid-Base Reactions and Buffers
A student prepares a water-quality sensor calibration solution containing both \(0.100\text{ M}\) \(\text{CH}_3\text{COOH}\) and \(0.100\text{ M}\) \(\text{CH}_3\text{COO}^-\) in a total volume of \(100.0\text{ mL}\). The equilibrium in the solution is represented by the following equation.
\(\text{CH}_3\text{COOH(aq)}+\text{H}_2\text{O(l)}\rightleftharpoons\text{H}_3\text{O}^+\text{(aq)}+\text{CH}_3\text{COO}^-\text{(aq)}\)
The student adds \(0.50\text{ mL}\) of \(0.100\text{ M}\) \(\text{HCl(aq)}\) to the solution. Which statement best predicts the change in pH and explains the buffer's response?
\(\text{CH}_3\text{COOH(aq)}+\text{H}_2\text{O(l)}\rightleftharpoons\text{H}_3\text{O}^+\text{(aq)}+\text{CH}_3\text{COO}^-\text{(aq)}\)
The student adds \(0.50\text{ mL}\) of \(0.100\text{ M}\) \(\text{HCl(aq)}\) to the solution. Which statement best predicts the change in pH and explains the buffer's response?
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