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A student tests an aqueous solution with a universal indicator and observes a green colour. The student says that the solution is acidic. What is the correct correction to this statement?

Answer and explanation

Correct answer: Green indicates that the solution is neutral and has a pH of about 7.

The governing concept is the colour scale of a universal indicator. Around pH 7, the indicator appears green, showing a neutral solution. Acidic solutions have pH values below 7 and generally produce colours ranging from yellow to red, whereas basic solutions have pH above 7 and tend toward blue or violet. The colour does not merely prove that a salt is present. Therefore, the student’s statement should be corrected as in option A.

Related tags

Universal IndicatorPh ScaleNeutral SolutionChemical IndicatorsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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