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What happens to hydrogen-ion concentration when water is added to an acidic solution?

Answer and explanation

Correct answer: The number of hydrogen ions per unit volume decreases, so acidity becomes lower

Dilution increases the total volume while the original amount of dissolved acid is distributed through that larger volume. Consequently, the hydrogen-ion concentration, [H⁺] or more precisely [H₃O⁺] in water, decreases. Since pH = −log[H⁺], the pH rises and the solution becomes less acidic, although it does not necessarily become basic. Thus option A is correct; dilution does not destroy all ions or automatically produce a basic solution.

Related tags

DilutionHydrogen IonsPhAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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