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What colour does phenolphthalein become in a basic solution?

Answer and explanation

Correct answer: Pink

Phenolphthalein is an acid–base indicator whose colour depends on the nature of the solution. In an acidic or neutral medium it remains colourless, but in a sufficiently basic medium it changes to pink. Therefore, the correct answer is option A, pink. Colourless, yellow, and blue do not represent the characteristic alkaline colour of phenolphthalein.

Related tags

ScienceClass10Acids-Bases-SaltsPhenolphthaleinIndicatorsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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