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Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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The neutralization of a 0.455 g sample of recrystallized aspirin required 38.6 mL of 0.100 M N2OH solution. An additional 25.0 mL of 0.100 M NAOH was added to the sample to hydrolyze the neutralized aspirin in the solution. The solution was heated. Phenolphthalein was added to the cooled solution and was back-titrated with 11.2 mL of 0.100 M HCI. Which of the following statements is true? Select one: A. Before the solution is titrated with HCl it is pink and when the color changes from pink to coloriess, the moles of H*(aq) equals the moles of OH-(aq) used in the hydrolysis of the neutralized aspirin. B. Before the solution is titrated with HCl it is colorless and when the color changes from coloriess to pink, the moles of H"(aq) equals the excess moles of OH"(aq) added. C. 25.0 ml of 0.100 M N2OH was added to the sample to hydrolyze the neutralized aspirin in the solution. The titration with HCl allows us to determine the moles of excess OH-(aq) added. Once we determine the moles of excess OH"(aq), we can determine moles of OH"(aq) used in the hydrolysis of the neutralized aspirin, which is equal to the moles of aspirin in the recrystallized aspirin. D. We can determine the moles of aspirin in the recrystallized aspirin by titrating with the 0.100 M N2OH to the neutralization point. The purpose of the hydrolysis of the neutralized aspirin and the back- titration with the 0.100 M HCI is to confirm the moles of aspirin in the recrystallized aspirin. E. Two of the statements are true.
Transcribed Image Text:The neutralization of a 0.455 g sample of recrystallized aspirin required 38.6 mL of 0.100 M N2OH solution. An additional 25.0 mL of 0.100 M NAOH was added to the sample to hydrolyze the neutralized aspirin in the solution. The solution was heated. Phenolphthalein was added to the cooled solution and was back-titrated with 11.2 mL of 0.100 M HCI. Which of the following statements is true? Select one: A. Before the solution is titrated with HCl it is pink and when the color changes from pink to coloriess, the moles of H*(aq) equals the moles of OH-(aq) used in the hydrolysis of the neutralized aspirin. B. Before the solution is titrated with HCl it is colorless and when the color changes from coloriess to pink, the moles of H"(aq) equals the excess moles of OH"(aq) added. C. 25.0 ml of 0.100 M N2OH was added to the sample to hydrolyze the neutralized aspirin in the solution. The titration with HCl allows us to determine the moles of excess OH-(aq) added. Once we determine the moles of excess OH"(aq), we can determine moles of OH"(aq) used in the hydrolysis of the neutralized aspirin, which is equal to the moles of aspirin in the recrystallized aspirin. D. We can determine the moles of aspirin in the recrystallized aspirin by titrating with the 0.100 M N2OH to the neutralization point. The purpose of the hydrolysis of the neutralized aspirin and the back- titration with the 0.100 M HCI is to confirm the moles of aspirin in the recrystallized aspirin. E. Two of the statements are true.
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