What is the approximate pH level in the stomach?

The pH level in the stomach is typically very acidic, generally ranging around 1.5 to 3.5. This acidity is primarily due to the presence of hydrochloric acid (HCl), which is secreted by the stomach lining to aid in digestion and to protect against pathogens.

Choosing a pH level of 2 accurately reflects the highly acidic environment of the stomach. This level is sufficient to denature proteins, activate digestive enzymes such as pepsin, and facilitate the breakdown of food. A pH level around 2 effectively supports the many functions of gastric acid, making it essential for proper digestion.

In contrast, a pH of 1 would be too extreme and less representative of typical conditions in the stomach, while pH levels of 3 and 5 would suggest a much lower acidity, which is not characteristic of the gastric environment.