Why can sodium hydrogen carbonate be considered a useful antacid in excess acidity?
Answer and explanation
Correct answer: It can neutralise excess acid
Sodium hydrogen carbonate, NaHCO₃, is a mild base. In excess stomach acidity, it reacts with hydrochloric acid and reduces the concentration of excess acid: NaHCO₃ + HCl → NaCl + H₂O + CO₂. Therefore, option A is correct because neutralisation can provide relief. Option B is opposite to its action, while C and D do not describe an acid–base reaction.
Frequently asked questions
What is the correct answer to this question?
It can neutralise excess acid
Why is this the correct answer?
Sodium hydrogen carbonate, NaHCO₃, is a mild base. In excess stomach acidity, it reacts with hydrochloric acid and reduces the concentration of excess acid: NaHCO₃ + HCl → NaCl + H₂O + CO₂. Therefore, option A is correct because neutralisation can provide relief. Option B is opposite to its action, while C and D do not describe an acid–base reaction.
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.
