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If a solution turns red litmus blue and phenolphthalein pink, what is its likely pH?

Answer and explanation

Correct answer: 11

Red litmus turning blue demonstrates that the solution is basic, while phenolphthalein becoming pink confirms an alkaline medium. A pH greater than 7 is therefore required. Of the choices, pH 11 clearly represents a basic solution; pH 2 and 5 are acidic, and pH 7 is neutral, so they cannot explain both indicator changes.

Related tags

IndicatorsPhenolphthaleinPhAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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