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

Answer and explanation

Correct answer: It can react with carbon dioxide

Sodium hydroxide is a strong, hygroscopic base that can absorb moisture and react with carbon dioxide from air. The acidic oxide CO₂ reacts with NaOH to form sodium carbonate, or sodium hydrogen carbonate under some conditions; for example, 2NaOH + CO₂ → Na₂CO₃ + H₂O. This converts part of the original substance into another compound and lowers its purity. Therefore option A is correct.

Related tags

Sodium HydroxideCarbon DioxideBasesAcidsAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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