AP Chemistry
8.4 Acid-Base Reactions and Buffers
4.8 Introduction to Acid-Base Reactions
Multi-Unit
An aqueous buffer solution is prepared containing both dihydrogen phosphate ions, \(\text{H}_2\text{PO}_4^-\text{(aq)}\), and hydrogen carbonate ions, \(\text{HCO}_3^-\text{(aq)}\). The system establishes the following dynamic equilibrium:
\[ \text{H}_2\text{PO}_4^-\text{(aq)} + \text{HCO}_3^-\text{(aq)} \rightleftharpoons \text{HPO}_4^{2-}\text{(aq)} + \text{H}_2\text{CO}_3\text{(aq)} \]
Which of the following correctly identifies a conjugate acid-base pair in this reaction and the role of \(\text{HPO}_4^{2-}\text{(aq)}\) in the reverse reaction?
\[ \text{H}_2\text{PO}_4^-\text{(aq)} + \text{HCO}_3^-\text{(aq)} \rightleftharpoons \text{HPO}_4^{2-}\text{(aq)} + \text{H}_2\text{CO}_3\text{(aq)} \]
Which of the following correctly identifies a conjugate acid-base pair in this reaction and the role of \(\text{HPO}_4^{2-}\text{(aq)}\) in the reverse reaction?
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