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If the pH of a solution is brought from 11 close to 7, which ion is being effectively reduced?

Answer and explanation

Correct answer: Hydroxide ion

The governing concept is the relationship between pH and hydroxide concentration in a basic solution. A pH of 11 indicates alkalinity, so hydroxide ions are present in relatively high effective concentration. Bringing the pH closer to 7 means neutralising the base, usually by adding acid; hydrogen ions react with hydroxide ions according to H⁺ + OH⁻ → H₂O. Thus the effective amount of OH⁻ decreases, making option C correct. Chloride and nitrate ions do not determine this change.

Related tags

PhBasicityHydroxide IonsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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