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If adding water to an acidic solution changes its pH from 2 to 3, what happens to acidity?

Answer and explanation

Correct answer: Acidity decreases tenfold

The governing concept is the logarithmic pH scale: pH = −log₁₀[H⁺]. A rise from pH 2 to pH 3 is an increase of one pH unit, so the hydrogen-ion concentration becomes 10 times smaller. For example, it changes from about 10⁻² mol/L to 10⁻³ mol/L. The solution is still acidic because its pH is below 7, but its acidity, measured through hydrogen-ion concentration, decreases tenfold. Therefore A is correct.

Related tags

PhDilutionAcidityHydrogen-Ion ConcentrationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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