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When water is added to an acidic solution, the number of hydrogen ions per unit volume decreases. What will be the effect on pH?

Answer and explanation

Correct answer: pH will increase

pH is defined as the negative logarithm of hydrogen-ion concentration: pH = −log[H⁺]. Adding water dilutes the acid, so the hydrogen-ion concentration per unit volume decreases. A smaller [H⁺] gives a larger pH value, although the solution may still remain acidic if its pH is below 7. Therefore, option A is correct. Dilution does not automatically make the pH zero or leave it unchanged.

Related tags

DilutionAcidic-SolutionHydrogen-IonsPhAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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