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Why does pH increase when hydroxide ions are added to an acidic solution?

Answer and explanation

Correct answer: They combine with hydrogen ions to form water.

pH is related inversely to hydrogen-ion concentration: when hydrogen-ion concentration decreases, pH rises. An acidic solution contains excess H⁺ ions. Added hydroxide ions, OH⁻, react with them according to H⁺ + OH⁻ → H₂O. This neutralisation removes free hydrogen ions from the solution, so its acidity falls and its pH increases. The other choices describe neither the relevant reaction nor the reason for the pH change.

Related tags

Hydroxide IonNeutralisationPhAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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