Lab #6 - The pH Scale and Acid-Base Titrations Sylwester...

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The pH Scale and Acid-Base Titrations Sylwester Czado Chemistry 191 Lab Report, Experiment #27 Lab partners: Ellen Richer, Michael Folcarelli, and Bukola Bakare Instructor: Brian Corbett 10-13-05
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Introduction The purpose of doing this particular experiment was to learn the difference between the H 3 O + concentration and the total acidity of an acid. I also learned the technique of acid-base titration by using a buret to measure volume. Then we used an acid-base indicator to determine the end point of the titration. We used this particular experiment to quantitatively determine the neutralization capacity of various commercial antacid tablets. Procedure Special Supplies: Parts 2 and 3 (we did not do Part 1): Macroscale= 25- or 50-mL buret Part 2: Distilled white vinegar (5% by weight acetic acid) Part 3: Stomach antacids (Tums Antacid Chewable Tablets, Regular- CaCO 3 ; Phillips Milk of Magnesia tablets- [Mg (OH) 2 ]; etc.); 5-mL pipet; polyethylene transfer pipet. Chemicals: Parts 2 and 3: 0.1% Thymol Blue Indicator Part 2: (standardization and vinegar titration) Macroscale: 0.1 M NaOH Part 3: (antacid titration) Macroscale: 0.30 M NaOH Safety Precautions: Part 2: Wear eye protection because sodium hydroxide is corrosive. Do not touch or handle any chemicals with your bare hands. Clean up any spills immediately. Part 3: Use a hot plate to heat the flask of HCl containing an antacid tablet if it is available. If you use a Bunsen burner, the flask must be clamped so that it cannot be overturned. Boiling a hot solution that splashes on you from the bench top can cause serious burns.
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Waste Disposal: Collect all the wastes in one beaker and neutralize with sodium bicarbonate. Then flush it down the drain. Part 2. Titration of Vinegar:
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This note was uploaded on 04/30/2008 for the course BIO 244 taught by Professor Van sciver during the Fall '06 term at Rhode Island.

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Lab #6 - The pH Scale and Acid-Base Titrations Sylwester...

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