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Why does sodium hydroxide not remain pure when kept in open air?

Answer and explanation

Correct answer: It is affected by both moisture and carbon dioxide

The governing concept is the deliquescent and reactive nature of sodium hydroxide. Solid NaOH absorbs moisture from air, so it becomes wet and its composition is altered. It also reacts with atmospheric carbon dioxide to form sodium carbonate: 2NaOH + CO2 → Na2CO3 + H2O. Thus option A is correct. Sodium hydroxide does not form gold with oxygen, does not make salt with nitrogen, and clearly does change in moist air.

Related tags

Sodium HydroxideCarbon DioxideChemical StorageAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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