What colour does phenolphthalein show in a basic solution?
Answer and explanation
Correct answer: Pink
Phenolphthalein is colourless in acidic and nearly neutral conditions, but its structure changes in a sufficiently basic medium and produces a pink colour. Thus, when phenolphthalein is added to a basic solution, the appearance of pink indicates alkalinity. Colourless is associated with an acidic medium, while red and yellow are not the standard phenolphthalein result. Therefore, option C is correct.
Frequently asked questions
What is the correct answer to this question?
Pink
Why is this the correct answer?
Phenolphthalein is colourless in acidic and nearly neutral conditions, but its structure changes in a sufficiently basic medium and produces a pink colour. Thus, when phenolphthalein is added to a basic solution, the appearance of pink indicates alkalinity. Colourless is associated with an acidic medium, while red and yellow are not the standard phenolphthalein result. Therefore, option C is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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