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What happens to the number of hydrogen ions per unit volume when water is added to an acidic solution?

Answer and explanation

Correct answer: It decreases

The governing concept is dilution. Adding water increases the total volume of an acidic solution while the amount of acid already present does not increase. Consequently, the concentration, or number of hydrogen ions per unit volume, decreases. The solution becomes less acidic and its pH generally rises toward 7, although it does not necessarily become neutral. Thus option A is correct; the other choices contradict dilution or describe impossible changes.

Related tags

DilutionHydrogen-IonsPhAcidic-SolutionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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