Baking soda (NaHCO₃) is used in antacid tablets mainly because it:
- thickens stomach lining
- neutralises stomach acid
- kills stomach bacteria
- absorbs water in gut
Show answer and solution
Correct answer: B. neutralises stomach acid
NaHCO₃ is a mild base.
In the acidic stomach it neutralises excess HCl, easing the discomfort of acidity.