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Which substance increases the amount of hydroxide ions when dissolved in water?

Answer and explanation

Correct answer: Sodium hydroxide

According to the Arrhenius concept, a base increases the concentration of hydroxide ions in aqueous solution. Sodium hydroxide dissociates almost completely in water: NaOH(aq) → Na⁺(aq) + OH⁻(aq), so it is a strong base and clearly gives OH⁻ ions. Hydrochloric acid, lemon juice, and vinegar are acidic substances that increase hydrogen-ion concentration instead. Therefore, option C is correct.

Related tags

BasesHydroxide-IonsSodium-HydroxideArrhenius-ConceptClass10AcidsAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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