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If an acidic solution is diluted ten times with water, which change is expected?

Answer and explanation

Correct answer: pH will increase but the solution may still remain acidic

The governing concept is the effect of dilution on hydrogen-ion concentration. Diluting an acidic solution tenfold reduces [H⁺] to one-tenth. Since pH = −log[H⁺], the pH rises by about one unit for an ideal strong-acid solution, but it generally remains below 7 unless the dilution is sufficient or other effects are considered. Thus acidity decreases without automatically becoming basic. Option B is correct; A, C, and D contradict this relationship.

Related tags

DilutionPhHydrogen-Ion ConcentrationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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