Stomach acid has a pH of about 2. What is the pH of an antacid that is used to neutralize stomach acid?
The pH level of a common antacid, calcium carbonate, is 9.91.
Calcium carbonate is widely used medicinally as an inexpensive dietary calcium supplement for gastric antacid. Calcium carbonate also is used as an antacid to relieve heartburn, acid indigestion, and upset stomach.