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A student places blue litmus paper in an acidic solution. What colour will the litmus paper become?

Answer and explanation

Correct answer: Red

Litmus is a natural acid–base indicator. Its governing colour rule is that an acidic solution changes blue litmus to red. Therefore, option A is correct. Blue litmus generally remains blue in a neutral or basic solution, while green and yellow are not the standard results for this indicator test. The colour change provides evidence that hydrogen ions are present in the solution.

Related tags

Acids Bases SaltsLitmus PaperAcidic SolutionIndicatorsChemical PropertiesAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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