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A student adds sodium hydroxide solution to an acidic solution to increase its pH. Which statement is correct during this process?

Answer and explanation

Correct answer: The hydrogen-ion concentration decreases and the solution moves towards neutrality.

Sodium hydroxide is a strong base and dissociates to provide OH⁻ ions. These ions react with hydrogen ions from the acid: H⁺ + OH⁻ → H₂O. Consequently, the hydrogen-ion concentration decreases and the pH rises, initially moving the solution towards neutrality. Sodium hydroxide is not an acid, and a pH change does not require adding pure water separately. Thus, option A is correct.

Related tags

Acids And BasesPhNeutralisationSodium HydroxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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