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If hydroxide ions are added to an acidic solution, what change will occur first?

Answer and explanation

Correct answer: Hydrogen ions will decrease by forming water

An acidic solution contains an excess of hydrogen ions, H⁺. The governing neutralisation concept is H⁺ + OH⁻ → H₂O. When hydroxide ions are added, they first consume hydrogen ions to form water, so the hydrogen-ion concentration decreases and the pH begins to rise. The solution does not instantly become solid, and neutralisation does not convert salt into metal. Therefore option A is correct.

Related tags

NeutralisationHydroxide IonsPhHydrogen IonsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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