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Why can sodium hydroxide slowly form carbonate when left open in air?

Answer and explanation

Correct answer: Because it reacts with carbon dioxide from air

Sodium hydroxide is hygroscopic and can absorb moisture, but it also absorbs carbon dioxide from air. The absorbed carbon dioxide reacts with sodium hydroxide, for example: 2NaOH + CO₂ → Na₂CO₃ + H₂O. Therefore option A is correct. Nitrogen, oxygen, and noble gases do not explain the gradual formation of sodium carbonate under ordinary storage conditions.

Related tags

Sodium HydroxideCarbon DioxideCarbonate FormationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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