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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.

Related tags

PhenolphthaleinBasic SolutionIndicator ColourAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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