How can sodium hydroxide form sodium carbonate when kept in open air?
Answer and explanation
Correct answer: By reacting with carbon dioxide in air
Sodium hydroxide is a strong base, while carbon dioxide is an acidic oxide present in air. When solid sodium hydroxide is exposed to air, it absorbs carbon dioxide and reacts with it: 2NaOH + CO₂ → Na₂CO₃ + H₂O. Thus sodium carbonate is formed. Nitrogen and oxygen do not produce this salt, and water does not become an acid in this process, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
By reacting with carbon dioxide in air
Why is this the correct answer?
Sodium hydroxide is a strong base, while carbon dioxide is an acidic oxide present in air. When solid sodium hydroxide is exposed to air, it absorbs carbon dioxide and reacts with it: 2NaOH + CO₂ → Na₂CO₃ + H₂O. Thus sodium carbonate is formed. Nitrogen and oxygen do not produce this salt, and water does not become an acid in this process, so option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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