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What is the change in enthalpy 1H2 for a chemical reaction How is H different from E 2

Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro ISBN: 9780321809247 1

Solution for problem 20 Chapter 6

Chemistry: A Molecular Approach | 3rd Edition

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Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro

Chemistry: A Molecular Approach | 3rd Edition

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Problem 20

What is the change in enthalpy 1H2 for a chemical reaction? How is H different from E? 2

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Conclusion In our experiment we tested the pH of different antacids to see which has the greatest effect on stomach acid. We hypothesized that the alka- seltzer tablet would reduce the acidity in the stomach acid the most, which it did. Our goal was to find out which antacid people should buy that will help most with stomach acid problems. The stomach acid had a pH of 1.5 before anything was added. When we added a dose of Pepto Bismol to one beaker, it changed the pH to 2.02, this was the least effective antacid we used. This antacid barely changed the acidity, meaning it would be the least helpful to any person having stomach acid issues, we would not recommend. The Gaviscon and the Tums tablets changed the pH about the same. The Tums beaker produced a pH of 5.82 and the Gaviscon became 5.41. These will work pretty well but not as well as the alka-seltzer. The alka-seltzer tablet brought the pH up to 6.17 which is almost neutral. If we could redo this experiment again, we would make some changes in creating the stomach acid. During the process of creating the stomach acid, we could have been more careful when adding H20 to our solution, effecting the amount of HCl to water ratio. We knew that the pH of stomach acid is generally between 1.5 and 3.5. When we first tested the pH levels we were at 0.88. We had to dilute the water using distilled water to raise the pH to better replicate stomach acid. If we tried more antacids to see different results from a bigger variety of antacids, our experiment could have been more accurate.

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Chapter 6, Problem 20 is Solved
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Textbook: Chemistry: A Molecular Approach
Edition: 3
Author: Nivaldo J. Tro
ISBN: 9780321809247

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What is the change in enthalpy 1H2 for a chemical reaction How is H different from E 2