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The colour of phenolphthalein indicator in alkaline solution at the end-point of an acid-base titration...

Chemistry
WAEC 2011

The colour of phenolphthalein indicator in alkaline solution at the end-point of an acid-base titration is?

  • A. colourless
  • B. orange
  • C. pink
  • D. yellow
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Correct Answer: Option C
Explanation

Phenolphthalein is one of the most commonly-used indicators in neutralisation titration.

Phenolphthalein is naturally colorless but turns pink in alkaline solutions.

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