Why does effervescence occur when sodium hydrogen carbonate is mixed with an acid?
Answer and explanation
Correct answer: Due to evolution of carbon dioxide gas
Sodium hydrogen carbonate reacts with an acid in an acid–carbonate reaction. For example, NaHCO₃ + HCl → NaCl + H₂O + CO₂. The carbon dioxide is released rapidly as gas bubbles, and these bubbles produce visible effervescence. No oxygen is absorbed, water does not freeze as the cause, and sodium metal is not formed because the sodium remains in the salt solution as ions.
Frequently asked questions
What is the correct answer to this question?
Due to evolution of carbon dioxide gas
Why is this the correct answer?
Sodium hydrogen carbonate reacts with an acid in an acid–carbonate reaction. For example, NaHCO₃ + HCl → NaCl + H₂O + CO₂. The carbon dioxide is released rapidly as gas bubbles, and these bubbles produce visible effervescence. No oxygen is absorbed, water does not freeze as the cause, and sodium metal is not formed because the sodium remains in the salt solution as ions.
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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