Lab Report - Rowlands 1 Analysis of Commercial Antacids...

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Rowlands 1 Analysis of Commercial Antacids Containing Calcium Carbonate Kevin Rowlands 12/06/07
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Purpose : The purpose of this experiment is to study and understand acid-base reactions. It will also teach the technique of titration, which determines the molarity of a solution. Introduction : Princeton students describe an antacid as “an agent that counteracts or neutralizes acidity (especially in the stomach)” (wordnet.princeton.edu). In this experiment, we will analyze a commercial antacid for the amount of calcium carbonate present. The stomach contains among other things, hydrochloric acid (Carter, biology.clc.uc.edu). This is the acid that causes the gastric juices in the stomach to digest food at a pH of around 2 or 3(Carter, biology.clc.uc.edu). Many people believe that heartburn is caused by an overabundance of stomach acid, but this is not true. The stomach acid refluxing up through the esophageal sphincter, the valve separating the esophagus from the stomach causes heartburn(Carter, biology.clc.uc.edu). The esophagus does not have a mucus lining like the stomach. This lack of mucus causes a burning sensation due to the irritation by acid in the esophagus(Carter, biology.clc.uc.edu). Antacids give relief not by neutralizing the stomach acid, but by raising the pH to about 3 or 4(Carter, biology.clc.uc.edu). Most commercial acids contain one or more of the following neutralizing agents: calcium carbonate, sodium bicarbonate or salts of magnesium or aluminum. Antacid tablets also contain other ingredients to perform such tasks as holding the tablet together. The first term we must become familiar with is molarity which is the measure of the concentration of a solution and has the symbol M. M = molarity = moles of solutelitres of solution The solute is the material that is the dissolved in the solvent. In this case, the solvent will be water. In the experiment, 250mL of a 0.01M solution of sodium hydroxide (NaOH) is required to be made. The concept we will become most familiar with is that of acid-base chemistry. Pam
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Lab Report - Rowlands 1 Analysis of Commercial Antacids...

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