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Universal indicator gives blue colour in a solution. After adding acid, the colour becomes green. What does this mean?

Answer and explanation

Correct answer: The solution changed from basic to nearly neutral

Universal indicator gives a range of colours linked to pH. Blue generally indicates an alkaline solution, whereas green represents a pH close to neutral. Adding acid consumes some hydroxide ions and lowers the pH, moving the colour from blue toward green. Therefore option B is correct. The observation does not by itself prove that the solution became strongly acidic or that only a gas formed.

Related tags

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

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