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1. The purity of a pharmaceutical preparation of sulfanilamide, C₂H₂N₂O,S, can be determined by oxidizing the sulfur to SO, and bubbling the SO, through H₂O₂ to produce H₂SO4. The acid is then titrated with a standard solution of NaOH to the bromothymol blue end point, where both of sulfuric acid's acidic protons have been neutralized. Calculate the purity of the preparation, given that a 0.6315-g sample required 85.31 mL of 0.08531 M NaOH.

1. The purity of a pharmaceutical preparation of sulfanilamide, C₂H₂N₂O,S, can be determined by oxidizing the sulfur to SO, and bubbling the SO, through H₂O₂ to produce H₂SO4. The acid is then titrated with a standard solution of NaOH to the bromothymol blue end point, where both of sulfuric acid's acidic protons have been neutralized. Calculate the purity of the preparation, given that a 0.6315-g sample required 85.31 mL of 0.08531 M NaOH.

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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1. The purity of a pharmaceutical preparation of sulfanilamide, C.H.N₂O₂S, can be determined by oxidizing the sulfur to SO, and bubbling the SO₂ through H₂O₂ to produce H₂SO4. The acid is then titrated with a standard solution of NaOH to the bromothymol blue end point, where both of sulfuric acid's acidic protons have been neutralized. Calculate the purity of the preparation, given that a 0.6315-g sample required 85.31 mL of 0.08531 M NaOH. 2. Titration of 0.3095, 0.3033, and 0.3081 g KHP requires 15.55, 15.1, and 15.25 mL of NaOH to reach the phenolphthalein endpoint. Report the standardized concentration of NaOH.
Transcribed Image Text:1. The purity of a pharmaceutical preparation of sulfanilamide, C.H.N₂O₂S, can be determined by oxidizing the sulfur to SO, and bubbling the SO₂ through H₂O₂ to produce H₂SO4. The acid is then titrated with a standard solution of NaOH to the bromothymol blue end point, where both of sulfuric acid's acidic protons have been neutralized. Calculate the purity of the preparation, given that a 0.6315-g sample required 85.31 mL of 0.08531 M NaOH. 2. Titration of 0.3095, 0.3033, and 0.3081 g KHP requires 15.55, 15.1, and 15.25 mL of NaOH to reach the phenolphthalein endpoint. Report the standardized concentration of NaOH.
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