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If a solution showing blue colour with universal indicator turns green after adding acid, what happened?

Answer and explanation

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

Universal indicator gives different colours over a pH range: blue generally indicates a basic solution, while green indicates a value close to neutral. When acid is added, hydrogen ions react with hydroxide ions in the basic solution, reducing its alkalinity. If the colour becomes green, the mixture has reached approximately neutral pH. It has not become more basic, and the observation does not prove that it is a strong acid.

Related tags

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

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