What colour does phenolphthalein give in a basic solution?
Answer and explanation
Correct answer: Pink
Phenolphthalein changes colour because its indicator form is different in an alkaline medium. It is colourless in acidic or insufficiently basic conditions, but in a basic solution it develops a pink colour. Thus option B is correct. Red is commonly associated with acidity for some other indicators, yellow may describe methyl orange in base, and colourless is the acidic response of phenolphthalein rather than its basic response.
Frequently asked questions
What is the correct answer to this question?
Pink
Why is this the correct answer?
Phenolphthalein changes colour because its indicator form is different in an alkaline medium. It is colourless in acidic or insufficiently basic conditions, but in a basic solution it develops a pink colour. Thus option B is correct. Red is commonly associated with acidity for some other indicators, yellow may describe methyl orange in base, and colourless is the acidic response of phenolphthalein rather than its basic response.
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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