Which acid does our stomach produce and what is its pH?
Hydrochloric acid (HCl); pH 1.5-3.5
The gastric glands in the stomach wall secrete hydrochloric acid (HCl) as part of gastric juice.
This acid makes the stomach contents strongly acidic, with a pH of about 1.5 to 3.5. The acidic medium activates the enzyme pepsin for protein digestion and kills germs in food.
Acetic acid is found in vinegar, lactic acid in curd and fatigued muscles, and citric acid in citrus fruits; none of these is produced by the stomach.
Hence, the answer is Hydrochloric acid (HCl); pH 1.5-3.5.
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