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Phenolphthlein is used as an indicator in acid base titrations because it is ha…

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Wize University Chemistry Textbook > Buffers and Titrations

Indicators

2 Activities

Phenolphthlein is used as an indicator in acid base titrations because it is halochromic, it changes color based on pH. Shown below are the two forms of phenolphthalein at low pH and high pH. One of the forms is colorless and one is bright purple. Which one is colored? Explain your answer.



More Indicators Questions:
The indicator cresol red has Ka = 5.0 x 10-9. Over what approximate pH range does it change colour?
Henderson Hasselbalch: Buffers and Indicators
The indicator cresol red has Ka = 5.0 x 10-9. Over what approximate pH range does it change colour?
Sketch the titration curve for a weak acid (Ka = 3.4 x 10-6) being titrated by a strong base. What is the pH at the equivalence point? What would be the ideal pKa value for an indicator in this titration?
For which type of titration will the pH be basic at the equivalence point?
Henderson Hasselbalch: Titrations
Suppose you performed a potentiometric titration on the solutions in flasks A, B, and C by a gradual addition of HCℓ (aq) to each flask shown.