Baking soda (sodium bicarbonate) acts as an antacid because it has the ability to neutralize stomach acid, thereby reducing the acidity in the stomach. When baking soda is mixed with water, it forms a basic solution, which means it has a high pH level. This basic solution then reacts with the hydrochloric acid (HCl) present in the stomach, which is responsible for the acidic environment.

The chemical reaction that takes place between baking soda and hydrochloric acid can be represented as follows:

NaHCO3 (sodium bicarbonate) + HCl (hydrochloric acid) → NaCl (sodium chloride) + H2O (water) + CO2 (carbon dioxide)

As a result of this reaction, the hydrochloric acid is neutralized, converting it into sodium chloride (table salt) and water. Additionally, the reaction produces carbon dioxide gas, which can cause the person to burp, further releasing the excess gas from the stomach and providing relief from symptoms such as bloating and flatulence.

By neutralizing the stomach acid and reducing the acidity, baking soda helps to relieve symptoms of indigestion, heartburn, and acid reflux. It is considered a mild antacid and is commonly used for short-term relief of occasional heartburn and upset stomach. However, it is not recommended for long-term use or for treating more severe cases of gastrointestinal problems. If symptoms persist or worsen, it is important to consult a healthcare professional for proper diagnosis and treatment.