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Which two factors can reduce the quality of sodium hydroxide when it is kept in open air?

Answer and explanation

Correct answer: Moisture and carbon dioxide

The governing concept is the hygroscopic and reactive nature of sodium hydroxide. Solid NaOH absorbs water vapour from air, so it becomes moist and its effective concentration or purity changes. It also reacts with atmospheric carbon dioxide to form sodium carbonate: 2NaOH + CO₂ → Na₂CO₃ + H₂O. Both processes reduce the quality of the stored chemical. Therefore option A is correct; oxygen, nitrogen, light, sound, glass, and rubber do not explain the stated loss under ordinary storage conditions.

Related tags

Sodium HydroxideMoistureCarbon DioxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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