Chemistry / Unit 10 Chem 1868 short lesson, about 20 seconds
Indicator Color-Change Range and Titration Indicator Choice
Captions available
The idea
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.
In practice
Phenolphthalein, changing near pH 8–10, suits a strong acid–strong base titration, whose jump spans that range.
Where people slip
An indicator whose range falls outside the pH jump changes color too early or too late.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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