EXPERIMENT 19 Rolai Alka An Analysis of Commercial Antacids Setzer OBJECTIVES: D

Question

EXPERIMENT 19 Rolai Alka An Analysis of Commercial Antacids Setzer OBJECTIVES: Determine the per gram neutralizing ability of a commercial antacid Determine the per gram neutralizing ability of sodium bicarbonate Compare the effectiveness of several antacids. INTRODUCTION: "How do you spell relief?" The parietal cells in the stomach secrete sufficient hydrochloric acid to normally keep the acidity at about 0.10 Ma The flow of HCl increases when food enters the stomach and so acidity increases when you eat or drink. If overstimulation of gastric juices builds the concentration up too much, heartburn or to try indigestion often results. Sodium bicarbonate in baking soda) has used to this condition. Today we have a number of commercial products which purport to neutralize (or buffer) excess stomach acid. Television commercials greater effectiveness in neutralizing are Rolaids to consume weight in excess stomach acid. Tums claims to have one third more neutralizing power than other antacids. In this lab, we wi compare acid neutralizing capabilities for ourselves. Several types of commercial antacids will be tested and the results will be shared in class. Keep in mind that tablets may also contain flavors, sweeteners, binders, fi antifoam agents, pain etc. In this experiment, tablets will be analyzed only for their ability to neutralize acids. The active ingredient in antacids varies with the brand. The table below lists active ingredients in several brands. COMMERCIAL ANTACIDS' MAJOR ACTIVE INGREDIENTS Brand Active Agent Milk of Magnesia Mg(OH)2 Rolaids. Tums Alka-Seltzer II NaHCO3 and KHCO3 Mg(OH) and Al (OH) Maalox Al(OH)3 Gaviscon The H (actually Hyo from acids are neutralized by these agents as illustrated below: insoluble carbonates; Caco,(s) 2 H (aq) Ca (aq) H20 co20g) insoluble hydroxidesa Mg(OH20s) 2 H (aq) Mg (aq) 2 H2O(l)

Explanation / Answer

Solution- Gaviscon has two active ingredients which react with H+

NaHCO3
HCO3- + H+ ---> H2O. + CO2

CaCO3
CaCO3 + 2H+ ---> Ca2+ + H2O + CO2

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