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How do Antacids Work? 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 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 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 Antacids • The most common ingredient used is calcium carbonate [CaCO3], 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 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. How do Antacids Work? Your Task… • Design an experiment to test the effectiveness of some different liquid antacids. • Perform the experiment.
