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Question

What is the colour change observed in dil. HCl solution when phenolphthalein is added to it?


A
Colourless
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B
Pink
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C
Yellow
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D
Green
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Solution

The correct option is

C

Colourless

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.

Phenolphthalein acts as an indicator that turns the colour of the acidic solution colourless. When the indicator is added to dilute hydrochloric acid, the colour of the solution changes to colourless due to its acidic nature.


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