Indicator Color-Change Range and Titration Indicator Choice
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State
An indicator's color-change range spans roughly two pH units near its own pKa, and a titration indicator is chosen so its range falls inside the equivalence point's pH jump.
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Phenolphthalein, changing near pH 8–10, suits a strong acid–strong base titration, whose jump spans that range.
Watch for
An indicator whose range falls outside the pH jump changes color too early or too late.