Why can sodium hydrogen carbonate be used as an antacid?
Answer and explanation
Correct answer: Because it is mildly basic and neutralises excess acid
Sodium hydrogen carbonate, NaHCO₃, is a mild base. In the stomach it reacts with excess hydrochloric acid in a neutralisation reaction: NaHCO₃ + HCl → NaCl + H₂O + CO₂. This reduces excessive acidity, so option A is correct. It does not increase stomach acid, make water acidic, or act by dissolving tooth enamel. Its use should still be controlled because the reaction releases carbon dioxide and adds sodium.
Frequently asked questions
What is the correct answer to this question?
Because it is mildly basic and neutralises excess acid
Why is this the correct answer?
Sodium hydrogen carbonate, NaHCO₃, is a mild base. In the stomach it reacts with excess hydrochloric acid in a neutralisation reaction: NaHCO₃ + HCl → NaCl + H₂O + CO₂. This reduces excessive acidity, so option A is correct. It does not increase stomach acid, make water acidic, or act by dissolving tooth enamel. Its use should still be controlled because the reaction releases carbon dioxide and adds sodium.
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.
