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Sodium hydroxide kept in open air can be affected not only by moisture but also by carbon dioxide. Which substance can form?

Answer and explanation

Correct answer: Sodium carbonate

Sodium hydroxide is a strong base, whereas carbon dioxide is an acidic oxide. When sodium hydroxide absorbs carbon dioxide from air, an acid–base reaction occurs: 2NaOH + CO₂ → Na₂CO₃ + H₂O. Thus sodium carbonate can form. Calcium sulphate, ammonium chloride, and copper oxide require different reactants and are not products of this exposure.

Related tags

Sodium HydroxideCarbon DioxideSodium CarbonateAcidic OxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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