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Why can the strength of sodium hydroxide decrease when it is left exposed to air?

Answer and explanation

Correct answer: It reacts with carbon dioxide in the air

The governing concept is the reaction of a strong base with an acidic oxide. Sodium hydroxide absorbs carbon dioxide from air and can form sodium carbonate, for example: 2NaOH + CO₂ → Na₂CO₃ + H₂O. This consumes some NaOH, so less active base remains and its measured strength may decrease. Option A is correct; the other choices describe impossible or irrelevant changes.

Related tags

Sodium HydroxideCarbon DioxideStrong BaseCarbonateAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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