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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.

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.

Chemistry: Principles and Practice
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter18: Electrochemistry
Section: Chapter Questions
Problem 18.79QE
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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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