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.
Frequently asked questions
What is the correct answer to this question?
Sodium hydrogen carbonate
Why is this the correct answer?
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.
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.
