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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

The governing concept is neutralisation and the definition of pH. An acidic solution contains an excess of hydrogen or hydronium ions. Added hydroxide ions react with them to form water: H₃O⁺ + OH⁻ → 2H₂O, or equivalently H⁺ + OH⁻ → H₂O. This lowers hydrogen-ion concentration, and because pH = −log[H⁺], the pH rises. The other options do not describe neutralisation, so A is correct.

Related tags

Hydroxide IonsPhNeutralisationHydrogen IonsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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