What do you observe when you add a few drops of phenolphthalein to a test tube containing acetic acid?

Blue colour

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Red colour

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Colourless

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None of these

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Solution

The correct option is C Colourless
Phenolphthalein is a chemical compound with the formula $C_{20} H_{14} O_{4}$ and is often written as "HIn" or "phph" in shorthand notation. Phenolphthalein is often used as an indicator in acid-base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.
Acetic acid will remain colourless in phenolphthalein.

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