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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 colour depends on the pH of the solution. It is colourless in acidic and approximately neutral solutions, but it turns pink or magenta in a sufficiently basic solution. Therefore an acidic solution does not produce the pink colour associated with a base. Since blue and green are not its characteristic responses, option B, colourless, is correct.

Related tags

PhenolphthaleinAcidic SolutionIndicatorAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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