When a man with stomach pain went to the doctor, the physician identified acidity. Which of the following would be the suitable remedy for him?

Baking soda

The correct answer is option 2. Baking soda.

"Baking soda" (sodium bicarbonate) is a common household substance that can act as an antacid, providing relief from acidity. Here's how it works:

1. Neutralization of Stomach Acid: Baking soda is a basic (alkaline) substance. When it is ingested, it can react with excess stomach acid (hydrochloric acid) to neutralize it. The reaction can be represented as follows:

\[ \text{NaHCO}_3 + \text{HCl} \rightarrow \text{NaCl} + \text{H}_2\text{O} + \text{CO}_2 \]

In this reaction, sodium bicarbonate (baking soda) reacts with hydrochloric acid to form sodium chloride (table salt), water, and carbon dioxide.

2. Release of Carbon Dioxide:  The formation of carbon dioxide gas can result in burping or belching, providing some relief from the discomfort associated with excess gas in the stomach.

It's important to note that while baking soda can provide temporary relief from acidity, it should be used cautiously and in moderation. Excessive use of baking soda can lead to an imbalance in electrolytes and other potential side effects. Individuals with certain medical conditions, such as hypertension or kidney issues, should consult a healthcare professional before using baking soda as an antacid.

For persistent or severe acidity, it is advisable to seek medical advice for proper diagnosis and appropriate treatment. Lifestyle and dietary changes may also be recommended to manage acidity in the long term.