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When acid is added to a solution, its pH goes below 7. Which ion has become relatively more abundant?

Answer and explanation

Correct answer: Hydrogen ion

The governing concept is the pH scale and its relation to hydrogen-ion concentration. A pH below 7 indicates an acidic solution, which means the effective concentration of hydrogen ions, often represented as H+ or hydronium ions H3O+, has increased relative to hydroxide ions. Adding acid therefore shifts the ion balance toward hydrogen ions. Calcium and sodium ions are not the defining cause of acidity, while increased hydroxide ions would indicate a basic tendency. Option A is correct.

Related tags

Hydrogen IonPhAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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