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Which change can bring the pH of a basic solution close to 7?

Answer and explanation

Correct answer: Adding a suitable amount of acid

A basic solution has pH above 7 because its hydroxide-ion concentration is relatively high. Adding a suitable amount of acid supplies hydrogen ions, which react with hydroxide ions in the neutralisation reaction H⁺ + OH⁻ → H₂O. This reduces the basic effect and can bring the pH close to 7, provided the amount is controlled. More base would raise pH, while removing water or changing salt into a gas does not describe the required neutralisation.

Related tags

NeutralisationPhBasesAcidsAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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