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How does phenolphthalein appear in an acidic solution?

Answer and explanation

Correct answer: Colourless

Phenolphthalein is an acid-base indicator whose visible colour depends on the acidity of the solution. In an acidic medium, and also in the nearly neutral range used in school tests, phenolphthalein remains colourless because its coloured alkaline form is not produced. Therefore option B is correct. Pink is observed in a sufficiently basic solution, while blue and green are not its characteristic colours.

Related tags

PhenolphthaleinAcidic SolutionAcid-Base IndicatorAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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