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Why do you use phenolphthalein as an indicator in titration of KHP and NaOH?

Answer 1

Because it works.

While there are a number of other indicators that could be used for this titration, phenolphthalein is an inexpensive, accessible, and useful indicator. It used to be my favorite because its acidic form is COLORLESS and its endpoint is easily identifiable from either direction.

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Answer 2

Avery Adams

Phenolphthalein is usually used since it is easy to detect visually a slight pink color from a colorless liquid solution.

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Answer 3

Noah Aldrich

Phenolphthalein changes color within the pH range of 8.2 to 10, making it suitable for the titration of KHP (potassium hydrogen phthalate) and NaOH (sodium hydroxide), as the equivalence point of this titration falls within this pH range.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.