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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

An acidic solution contains a relatively high concentration of hydrogen or hydronium ions. Added hydroxide ions react with them in the neutralisation step: H⁺ + OH⁻ → H₂O. This lowers the hydrogen-ion concentration. Since pH = −log[H⁺], a decrease in [H⁺] produces an increase in pH. The ions do not increase acidity or form carbon dioxide, so option A is correct.

Related tags

NeutralisationHydroxide IonsPhAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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