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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 & Chemical Reactivity
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter17: Principles Of Chemical Reactivity: Other Aspects Of Aqueous Equilibria
Section: Chapter Questions
Problem 35PS: Using Figure 17.11, suggest an indicator to use in each of the following titrations: (a) The weak...
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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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