When does phenolphthalein turn pink?

2 answers:

5 0

A.) Phenolphthalein is colorless in an acid, but it turns bright pink in the presence of a base.

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Svetach [21]3 years ago

3 0

Answer is: a) in the presence of a base.

Phenolphthalein is colorless in acidic solutions and pink in basic solutions.

Acid-base indicators are usually weak acids or bases and they are chemical detectors for hydrogen or hydronium cations.

Example for acid-base indicator is phenolphthalein (molecular formula C₂₀H₁₄O₄).

When solution turns phenolphthalein pink, it means it is basic (pH>7).

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