AP Chemistry
8.7 pH and pKa
8.5 Acid-Base Titrations
The acid-base indicator bromocresol green is a weak acid that dissociates in aqueous solution according to the equilibrium below.
\[ \text{HIn}\text{(aq)} + \text{H}_2\text{O}\text{(l)} \rightleftharpoons \text{H}_3\text{O}^+\text{(aq)} + \text{In}^-\text{(aq)} \quad\quad K_a = 1.0 \times 10^{-5} \text{ at } 25\text{ }^\circ\text{C} \]
In this system, \(\text{HIn}\text{(aq)}\) is yellow and \(\text{In}^-\text{(aq)}\) is blue. A student adds a few drops of bromocresol green to a buffer solution with a \(\text{pH}\) of \(3.50\) at \(25\text{ }^\circ\text{C}\). Which of the following correctly identifies the predominant form of the indicator in the buffer solution and the observed color of the solution?
\[ \text{HIn}\text{(aq)} + \text{H}_2\text{O}\text{(l)} \rightleftharpoons \text{H}_3\text{O}^+\text{(aq)} + \text{In}^-\text{(aq)} \quad\quad K_a = 1.0 \times 10^{-5} \text{ at } 25\text{ }^\circ\text{C} \]
In this system, \(\text{HIn}\text{(aq)}\) is yellow and \(\text{In}^-\text{(aq)}\) is blue. A student adds a few drops of bromocresol green to a buffer solution with a \(\text{pH}\) of \(3.50\) at \(25\text{ }^\circ\text{C}\). Which of the following correctly identifies the predominant form of the indicator in the buffer solution and the observed color of the solution?
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