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When excess carbon dioxide gas is passed through sodium hydroxide solution, what can finally be the main product?

Answer and explanation

Correct answer: Sodium hydrogen carbonate

Carbon dioxide is an acidic oxide. With limited CO₂, sodium hydroxide can form sodium carbonate: 2NaOH + CO₂ → Na₂CO₃ + H₂O. When CO₂ is passed in excess, the carbonate reacts further with carbonic acid and forms soluble sodium hydrogen carbonate: Na₂CO₃ + CO₂ + H₂O → 2NaHCO₃. Thus option A is correct.

Related tags

Acidic-OxideCarbon-DioxideSodium-HydroxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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