AP Chemistry
8.3 Weak Acid and Base Equilibria
8.1 Introduction to Acids and Bases
At \(25^\circ\text{C}\), a student analyzes a metal-treatment rinse containing a weak monoprotic acid, \(\text{HA}\). The student prepares a \(0.102\text{ M}\) solution of the acid and measures its pH to be \(2.70\). The acid ionizes according to the equation \(\text{HA(aq)}+\text{H}_2\text{O(l)}\rightleftharpoons\text{H}_3\text{O}^+\text{(aq)}+\text{A}^-\text{(aq)}\). Assume that the contribution of water autoionization to \([\text{H}_3\text{O}^+]\) is negligible. Which of the following is closest to the value of \(K_a\) for the acid?
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