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A mixture is prepared using 29.00 mL of a 0.0718 M weak base (pK, = 4.558), 29.00 mL of a 0.0524 M weak acid (pK, = 3.231) and 1.00 mL of 1.21 x 10-4 M HIn and then diluting to 100.0 mL, where HIn is the protonated indicator. The absorbance measured at 550 nm in a 5.000 cm cell was 0.1298. The molar absorptivity (e) values for HIn and its deprotonated form In at 550 nm are 2.26 x 10 M ¹cm¹ and 1.53 x 10 M-¹cm¹, respectively. What is the pH of the solution? pH = 4.27 What are the concentrations of In" and Hin? [In] = [Hin] = 6.62 x10-7 Incorrect 9.68 x10-7 M M

A mixture is prepared using 29.00 mL of a 0.0718 M weak base (pK, = 4.558), 29.00 mL of a 0.0524 M weak acid (pK, = 3.231) and 1.00 mL of 1.21 x 10-4 M HIn and then diluting to 100.0 mL, where HIn is the protonated indicator. The absorbance measured at 550 nm in a 5.000 cm cell was 0.1298. The molar absorptivity (e) values for HIn and its deprotonated form In at 550 nm are 2.26 x 10 M ¹cm¹ and 1.53 x 10 M-¹cm¹, respectively. What is the pH of the solution? pH = 4.27 What are the concentrations of In" and Hin? [In] = [Hin] = 6.62 x10-7 Incorrect 9.68 x10-7 M M

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
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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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A mixture is prepared using 29.00 mL of a 0.0718 M weak base (pK₁ = 4.558), 29.00 mL of a 0.0524 M weak acid (pK, = 3.231) and 1.00 mL of 1.21 x 10-4 M HIn and then diluting to 100.0 mL, where HIn is the protonated indicator. The absorbance measured at 550 nm in a 5.000 cm cell was 0.1298. The molar absorptivity (e) values for HIn and its deprotonated form In at 550 nm are 2.26 x 104 M-¹cm¹ and 1.53 x 104 M-¹cm¹, respectively. What is the pH of the solution? pH = 4.27 What are the concentrations of In and Hin? [In] = [Hin] = 6.62 X10-7 Incorrect 9.68 x10-7 I M M
Transcribed Image Text:A mixture is prepared using 29.00 mL of a 0.0718 M weak base (pK₁ = 4.558), 29.00 mL of a 0.0524 M weak acid (pK, = 3.231) and 1.00 mL of 1.21 x 10-4 M HIn and then diluting to 100.0 mL, where HIn is the protonated indicator. The absorbance measured at 550 nm in a 5.000 cm cell was 0.1298. The molar absorptivity (e) values for HIn and its deprotonated form In at 550 nm are 2.26 x 104 M-¹cm¹ and 1.53 x 104 M-¹cm¹, respectively. What is the pH of the solution? pH = 4.27 What are the concentrations of In and Hin? [In] = [Hin] = 6.62 X10-7 Incorrect 9.68 x10-7 I M M
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