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

Answer and explanation

Correct answer: Because hydroxide ions reduce hydrogen ions by forming water

An acidic solution contains a relatively high concentration of hydrogen ions, H⁺, and its pH is low. Added hydroxide ions react with hydrogen ions in the neutralisation reaction H⁺ + OH⁻ → H₂O. This removes free H⁺ ions from the solution, so the hydrogen-ion concentration decreases and pH rises. The solution may eventually approach neutrality, depending on the amounts added. Options B, C, and D do not describe this reaction. Therefore A is correct.

Related tags

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

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