Citric acid, a triprotic acid, has a pKa3 of 5.41, indicating that at a pH greater than 5.41, it does not exist entirely in its conjugate base form (A3-). At pH 5.41, the concentrations of the second deprotonated form (HA2-) and the fully deprotonated form (A3-) are equal. This relationship is crucial for understanding the behavior of weak acids in solution, as detailed in the referenced resource on acid-base titration indicators.
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