When you swallow eno, which is primarily composed of sodium bicarbonate, it comes into contact with the hydrochloric acid present in your stomach. A chemical reaction takes place, resulting in the formation of carbon dioxide gas, water, and sodium chloride (table salt).
The chemical equation for this reaction is:
NaHCO3 (sodium bicarbonate) + HCl (hydrochloric acid) → CO2 (carbon dioxide) + H2O (water) + NaCl (sodium chloride)
As the reaction occurs, small bubbles of carbon dioxide gas are produced and start accumulating in your stomach. Under normal circumstances, these gases can be expelled without much effort by burping.
Burping, also known as eructation, is a natural reflex that helps release excess gas from the stomach through the mouth. It occurs when the air pressure in the stomach builds up due to the presence of swallowed air or the production of gases during digestion.
In the case of eno, the chemical reaction that takes place releases a significant amount of carbon dioxide gas. When this gas accumulates in the stomach, it creates a feeling of fullness, pressure, and discomfort. Your body's natural response to this discomfort is to release the gas by burping.
So, burping after swallowing eno is a common side effect caused by the release of carbon dioxide gas during the neutralization reaction between eno and stomach acid. This burping typically helps relieve the discomfort associated with gas buildup in the stomach and facilitates the elimination of excess gas.