Concept explainers
Interpretation: Whether the value of Ka of an acid-base indicator changes when the indicator is added to an acid or a base or not needs to be explained.
Concept Introduction:An acid-base indicator is a visual indicator that signals the end of an
Answer to Problem 2E
The value of Ka of an acid-base indicator doesn’t change when the indicator is added to an acid or a base; however, the concentrations of the unionized and the ionized forms of the indicator change.
Explanation of Solution
An acid-base indicator is a weak acid that undergoes partial ionization in an aqueous solution as below.
Here HIn is the unionized indicator and In- is the ionized indicator.
The equilibrium constant for the above ionization is the acid ionization constant, Kagiven by the expression
Here, Ka is a
The addition of the indicator to an acid or a base doesn’t change the Ka of the indicator.
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