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Determine the pH during the titration of 32.5 mL of 0.333 M ethylamine (C₂H5NH₂, Kb = 4.3x10-4) by 0.333 M HCIO4 at the following points. (a) Before the addition of any HCIO4 (b) After the addition of 13.5 mL of HCIO4 (c) At the titration midpoint

Determine the pH during the titration of 32.5 mL of 0.333 M ethylamine (C₂H5NH₂, Kb = 4.3x10-4) by 0.333 M HCIO4 at the following points. (a) Before the addition of any HCIO4 (b) After the addition of 13.5 mL of HCIO4 (c) At the titration midpoint

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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**Determining pH During the Titration of Ethylamine** In this exercise, we will determine the pH during the titration of 32.5 mL of 0.333 M ethylamine (C₂H₅NH₂, \( K_b = 4.3 \times 10^{-4} \)) by 0.333 M HClO₄ at the following points: 1. **(a) Before the addition of any HClO₄** - Calculate the initial pH of the ethylamine solution. 2. **(b) After the addition of 13.5 mL of HClO₄** - Determine the pH after this volume of titrant is added. 3. **(c) At the titration midpoint** - Find the pH when half of the equivalent amount of acid has been added. 4. **(d) At the equivalence point** - Determine the pH at the point where moles of acid equal moles of base. 5. **(e) After adding 49.1 mL of HClO₄** - Calculate the pH after this excess volume of titrant is added. This exercise helps in understanding the changes in pH throughout the titration process, highlighting key points such as the titration midpoint and equivalence point.
Transcribed Image Text:**Determining pH During the Titration of Ethylamine** In this exercise, we will determine the pH during the titration of 32.5 mL of 0.333 M ethylamine (C₂H₅NH₂, \( K_b = 4.3 \times 10^{-4} \)) by 0.333 M HClO₄ at the following points: 1. **(a) Before the addition of any HClO₄** - Calculate the initial pH of the ethylamine solution. 2. **(b) After the addition of 13.5 mL of HClO₄** - Determine the pH after this volume of titrant is added. 3. **(c) At the titration midpoint** - Find the pH when half of the equivalent amount of acid has been added. 4. **(d) At the equivalence point** - Determine the pH at the point where moles of acid equal moles of base. 5. **(e) After adding 49.1 mL of HClO₄** - Calculate the pH after this excess volume of titrant is added. This exercise helps in understanding the changes in pH throughout the titration process, highlighting key points such as the titration midpoint and equivalence point.
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