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A solution gives orange colour with universal indicator and becomes yellow after adding more water. What is the correct conclusion?

Answer and explanation

Correct answer: The solution became less acidic but is still acidic

The governing concept is the indicator colour scale and dilution. Orange indicates an acidic solution, while yellow represents a less strongly acidic region on the universal-indicator scale. Adding water lowers the concentration of hydrogen ions, so the pH increases and the acidity decreases. However, a yellow colour does not prove that all acid has disappeared or that the solution has become basic. Ions remain present after dilution, so option A is correct.

Related tags

Universal IndicatorAcid DilutionPhAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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