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If a solution showing red colour with universal indicator turns green after adding base, what is the conclusion?

Answer and explanation

Correct answer: The solution changed from acidic to nearly neutral.

The governing principle is neutralisation. A red universal-indicator colour represents a strongly acidic region, with a relatively high hydrogen-ion concentration. Adding a base supplies hydroxide ions, which react with hydrogen ions to form water. This decreases acidity and moves the pH toward 7. Green indicates a nearly neutral mixture, so option A is correct. The result does not show that the solution became strongly basic or that the base had no effect.

Related tags

Universal IndicatorNeutralisationAcidAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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