Chemistry
Grade-10
Easy
Question
Which is the best description of “Phenolphthalein”?
- A weak acid that turns colorless when acidic and pink when basic.
- A strong acid that turns colorless when acidic and pink when basic.
- A weak acid that turns colorless when pink and acidic when basic.
- A strong acid that turns colorless when pink and acidic when basic.
Hint:
Phenolphthalein is acid base indicator.
The correct answer is: A weak acid that turns colorless when acidic and pink when basic.
- Phenolphthalein is a colourless, weak acid that is widely used as an indicator in titration experiments to indicate the endpoint of the titration.
- It turns colorless in acidic solutions and pink in basic solutions.
- Phenolphthalein is a weak acid that turns colorless when acidic and pink when basic.
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