Chem 110 Antacid Lab GRADED

Chem 110 Antacid Lab GRADED - Whats the Best Antacid?...

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Unformatted text preview: Whats the Best Antacid? George Fountain III Chemistry 110; Section 010 October 13, 2010 Lab Instructor: Yumi Matsumura Lab Partner: Kelly Starosta Abstract: Antacids are weak bases which eliminate heartburn through the neutralization of HCl (hydrochloric acid) in small amounts within the stomach. Titration is the process by which one unknown solutions concentration reacts within a known solutions concentration (standardized solution). During this experiment, titration was used to calculate the moles of HCl neutralized by the antacid, by knowing the moles of HCl initially added to the flask and moles of HCl neutralized by the NaOH. Despite the more expensive dose for the Alka Seltzer product, the best antacid was the Mylanta because it contained 0.02911 moles of HCl total produced, while the Alka Seltzer only contained 0.0072 moles of HCl produces total. Introduction: The purpose of the experiment was to use the back-titration process to calculate the amount of NaOH needed until the pH indicator changes color (to hit the endpoint). By already knowing the amount of moles of HCl initially within in the flask and amount of HCl moles neutralized by the NaOH, the moles of HCl neutralized by antacid can be calculated and determined. This is why we used back-titration instead of titration. Did you mean it reacted with 0.0072 moles of HCl? Is more effective. What do you know from this? the solution passed its endpoint The hypothesis for this experiment was that the Mylanta was the best antacid because it cost the most money to buy over the counter. Therefore, the customer should be buying more heartburn relief for their extra money paid. For calculating the moles of HCl within the solution of Mylanta, stoichiometry was used to convert the milligrams to grams, grams to moles (using molar mass), and moles to moles of HCl (based on the balanced chemical formula. To calculate the number of moles of HCl initially, when 0.4 M of HCl is added for 25 mL, the following formula is used (Equation1): Moles HCl (initially) = Molarity of HCl x (1 L)/1000 mL x ml of NaOH used To calculate the moles in 20 mL of 0.2 M of NaOH and determine the moles of HCl this will neutralize, the following equation was used (Equation 2): Moles HCl (NaOH neutralized) = M of NaOH x (1 L)/1000 mL x mL NaOH used x 1 mole of HCl / (1 mole NaOH) For calculating antacid neutralized in moles of HCl, the following equation was sued (Equation 3): Moles of HCl = (moles of HCl (initial)) (moles of HCl (NaOH neutralized)) The theoretical amount of moles of HCl that each active ingredient neutralizes per dose was calculated, along with the total moles of HCl neutralized by all of the active ingredients in one dose....
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This note was uploaded on 01/22/2011 for the course CHEM 110 taught by Professor Armstrong during the Fall '08 term at American.

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Chem 110 Antacid Lab GRADED - Whats the Best Antacid?...

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