Chemistrymedium · Past Paper
What is the color change when phenolphthalein is added to an alkaline solution (base)?
AColorless to red/pink
BPink to colorless
CBlue to red
DRed to blue
✓ Correct Answer: A — Colorless to red/pink
Phenolphthalein is a pH indicator that is colorless in acids and turns pink or red in basic (alkaline) solutions.
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