Question

Dilute hydrochloric acid is added to solid sodium carbonate. It is observed that :

• A. no change takes place
• B. a loud sound is produced
• C. a brisk effervescence occurs
• D. the solution turns blue

Answer 1

The correct option is C a brisk effervescence occurs

When dilute HCl, which is an acid, added to sodium carbonate, a basic salt, the neutralization reaction occurs by the formation of NaCl and the evolution of carbon dioxide gas by brisk effervescence.

$2HCl+N{a}_{2}C{O}_3⟶2NaCl+C{O}_2+H_{2}O$