MCQ
An element $X$ reacts with water to from a solution which turns phenolphthalein indicator pink. The element $X$ is most likely to be:
- ASulphur
- ✓Sodium
- CCarbon
- DSilicon
✓
Answer
Correct option: B.
Sodium
Phenolphthalein is an indicator used in acid-base titrations. It turns colorless in acidic solutions and pink in basic solutions. Sodium is a metal which reacts with water to form sodium hydroxide, which is a base. Hence, phenolphthalein turns the solution pink.
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