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If blue litmus turns red in a solution and its pH is 2, what changed when adding water makes the pH 4?

Answer and explanation

Correct answer: Acidity decreased but the solution is still acidic

The governing concept is the pH scale and dilution. Both pH 2 and pH 4 are below 7, so the solution remains acidic after water is added. Because pH increases, the hydrogen-ion concentration decreases; in fact, a two-unit rise represents a large reduction in hydrogen ions. Therefore acidity has decreased but has not disappeared, making option A correct. The other choices confuse dilution with becoming basic or claim the opposite ion change.

Related tags

PhDilutionAcidicityAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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