Question

why baking soda is used as a antacids?​

Answer 1

Answer:

Because it is a mild base and stomach acidity can be regulated using it.

Reaction: Acid + Base = Salt + Water

Answer 2

Answer:

The acidity in the stomach is caused due to the formation of excess of hydrochloric acid. Sodium hydrogen carbonate which is known as baking soda reacts with acid because of its alkaline nature and neutralise this effect.

$NaHCO_3+HCl→NaCl+H_2O+CO_2$

It therefore acts as an antacid and is the major constituent of antacid medicines.