111_Experiment_3_Text - Experiment 3 Stoichiometry...

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Experiment 3 Stoichiometry – Solution/Solution Evaluating Commercial Antacid's Lab Owl Announcement: Upon completion of this lab, log onto OWL. Your second Lab Owl assignment, Lab Owl: Exp 3, should appear there. You have until the next scheduled laboratory to complete this assignment. Two more assignments will appear here as the semester progresses. Remember, these Lab Owls are worth 25% of your laboratory grade. Introduction: Reactions Between Metal Carbonates and Acid: Heart burn and acid indigestion are primarily due to excess acid in the stomach. There are many preparations sold over the counter to relieve these conditions. Many of these act by neutralizing the excess acid in the stomach, and some may be more effective than others! In most of these products, other ingredients are added, flavoring agents and substances to soothe the walls and lining of the stomach, binders to make the tablet hold together and so forth. The active ingredients, however, are there to neutralize the excess acid in the stomach. Among the most common active ingredients are: Mg(OH) 2 (the active ingredient in milk of magnesia), NaHCO 3 (sodium bicarbonate) and CaCO 3 (calcium carbonate) and in some Al(OH) 3 (aluminum hydroxide). In our continuing foray into the world of stoichiometry we are going to evaluate some of the commercially available antacids by determining the amount of HCl (stomach acid!) that one tablet will neutralize. The reaction between the
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