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4. Sia wanted to determine the pKa of a certain unknown compound known as Anium Base. To do this, she employed potentiometric titration. She knew that the pKa of this base would be above pH 7, hence she used 0.05210M HCl as titrant. She took 0.2222g of Anium Base and then diluted it with 100mL of distilled water. She then took a 50mL aliquot and titrated this with the 0.05210M HCl titrant. Her results are found in Table 1. Table 1. Potentiometric Titration data of Anium Base Vtit, mL pH a. Given the data, tabulate and plot the 0th, 1st, and 2nd derivative titration curves. 2.5 10.87 b. What is the equivalence volume for the 1st and 2nd derivatives of the titration curve? 3.5 10.47 c. What is the pKa of Anium Base? 4.5 10.28 d. Given that the Anium Base reagent is of 93.00% purity, what is the molar mass of Anium Base? 5.5 10.15 Take note of significant figures. 6.5 10.02 7.5 9.84 9.5 9.54 10.5 8.74 11.5 5.69 12.5 4.29

4. Sia wanted to determine the pKa of a certain unknown compound known as Anium Base. To do this, she employed potentiometric titration. She knew that the pKa of this base would be above pH 7, hence she used 0.05210M HCl as titrant. She took 0.2222g of Anium Base and then diluted it with 100mL of distilled water. She then took a 50mL aliquot and titrated this with the 0.05210M HCl titrant. Her results are found in Table 1. Table 1. Potentiometric Titration data of Anium Base Vtit, mL pH a. Given the data, tabulate and plot the 0th, 1st, and 2nd derivative titration curves. 2.5 10.87 b. What is the equivalence volume for the 1st and 2nd derivatives of the titration curve? 3.5 10.47 c. What is the pKa of Anium Base? 4.5 10.28 d. Given that the Anium Base reagent is of 93.00% purity, what is the molar mass of Anium Base? 5.5 10.15 Take note of significant figures. 6.5 10.02 7.5 9.84 9.5 9.54 10.5 8.74 11.5 5.69 12.5 4.29

Chemistry
Chemistry
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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
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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4. Sia wanted to determine the pKa of a certain unknown compound known as Anium Base. To do this, she employed potentiometric titration. She knew that the pKa of this base would be above pH 7, hence she used 0.05210M HCl as titrant. She took 0.2222g of Anium Base and then diluted it with 100mL of distilled water. She then took a 50mL aliquot and titrated this with the 0.05210M HCl titrant. Her results are found in Table 1. Table 1. Potentiometric Titration data of Anium Base Vtit, mL pH a. Given the data, tabulate and plot the 0th, 1st, and 2nd derivative titration curves. 2.5 10.87 b. What is the equivalence volume for the 1st and 2nd derivatives of the titration curve? 3.5 10.47 c. What is the pKa of Anium Base? 4.5 10.28 d. Given that the Anium Base reagent is of 93.00% purity, what is the molar mass of Anium Base? 5.5 10.15 Take note of significant figures. 6.5 10.02 7.5 9.84 9.5 9.54 10.5 8.74 11.5 5.69 12.5 4.29 13.5 3.45 14.5 3.04
Transcribed Image Text:4. Sia wanted to determine the pKa of a certain unknown compound known as Anium Base. To do this, she employed potentiometric titration. She knew that the pKa of this base would be above pH 7, hence she used 0.05210M HCl as titrant. She took 0.2222g of Anium Base and then diluted it with 100mL of distilled water. She then took a 50mL aliquot and titrated this with the 0.05210M HCl titrant. Her results are found in Table 1. Table 1. Potentiometric Titration data of Anium Base Vtit, mL pH a. Given the data, tabulate and plot the 0th, 1st, and 2nd derivative titration curves. 2.5 10.87 b. What is the equivalence volume for the 1st and 2nd derivatives of the titration curve? 3.5 10.47 c. What is the pKa of Anium Base? 4.5 10.28 d. Given that the Anium Base reagent is of 93.00% purity, what is the molar mass of Anium Base? 5.5 10.15 Take note of significant figures. 6.5 10.02 7.5 9.84 9.5 9.54 10.5 8.74 11.5 5.69 12.5 4.29 13.5 3.45 14.5 3.04
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