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

Answer and explanation

Correct answer: Hydrogen ions convert into water

The governing concept is neutralisation and the definition of pH. An acidic solution contains an excess of hydrogen ions. Added hydroxide ions react with them according to H⁺ + OH⁻ → H₂O, decreasing the hydrogen-ion concentration. Since pH rises as hydrogen-ion concentration falls, option A correctly explains the increase. The other choices either describe the opposite trend or unrelated processes.

Related tags

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

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