1. How do Antacids Work?

2. Digestion in the Stomach The stomach produces hydrochloric acid to start breaking down the food you eat. This is a strong acid, but the stomach has a thick mucus lining to keep itself from being digested by the acid. http://www.functionalfitmag.com/blog/wp-content/uploads/2011/12/Stomach-Plain.jpg

3. Heartburn When the stomach is too full or when you have swallowed air, the acid is forced up out of the stomach into the unprotected esophagus. The acid reacts with the unprotected tissue and causes a burning sensation commonly known as "heart burn". healthletter.mayoclinic.com

4. Antacids A weak base with at least one of the active chemical ingredients of magnesium, sodium bicarbonate, calcium carbonate and aluminum hydroxide The active ingredient serves as a buffer nutrivize.com

5. Antacids The most common ingredient used is calcium carbonate [CaCO 3 ], also known as limestone. This limestone is ground to a powder, mixed with a starch paste, and formed into a tablet. Often flavoring and coloring is added to make the tablet more palatable and attractive. Other tablets contain insoluble hydroxides that will help neutralize hydrochloric acid. nutrivize.com

6. Acid Blockers There are also newer types of antacids that are taken before eating. These consist of a hormone [chemical messenger] that reduces the amount of acid produced by the stomach. This is not the type of antacid that we will evaluate in this lab.

7. How do Antacids Work?

8. Your Task… Design an experiment to test the effectiveness of some different liquid antacids. Perform the experiment.