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HIn H + I¯ color 1 color 2 The following absorbance data were obtained for a 5.00 × 104 M solution of HIn in 0.1 M NaOH and 0.1 M HCl. Measurements were made at a wavelength of 485 nm and 625 nm with 1.00-cm cells. 0.1 M NaOH: 0.1 M HCl: A485 0.05 A485=0.6 A625 = 0.8 A625 = 0.2 In the NaOH solution, essentially all of the indicator is present as In; in the acidic solution, it is essentially all in the form of HIn. Please calculate the acid dissociation constant for the indicator if a pH 5.00 buffer containing a small amount of the indicator exhibits an absorbance of 0.5 at 485 nm and 0.4 at 625 nm (1.00-cm cells).

HIn H + I¯ color 1 color 2 The following absorbance data were obtained for a 5.00 × 104 M solution of HIn in 0.1 M NaOH and 0.1 M HCl. Measurements were made at a wavelength of 485 nm and 625 nm with 1.00-cm cells. 0.1 M NaOH: 0.1 M HCl: A485 0.05 A485=0.6 A625 = 0.8 A625 = 0.2 In the NaOH solution, essentially all of the indicator is present as In; in the acidic solution, it is essentially all in the form of HIn. Please calculate the acid dissociation constant for the indicator if a pH 5.00 buffer containing a small amount of the indicator exhibits an absorbance of 0.5 at 485 nm and 0.4 at 625 nm (1.00-cm cells).

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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HIn H + I¯ color 1 color 2 The following absorbance data were obtained for a 5.00 × 104 M solution of HIn in 0.1 M NaOH and 0.1 M HCl. Measurements were made at a wavelength of 485 nm and 625 nm with 1.00-cm cells. 0.1 M NaOH: 0.1 M HCl: A485 0.05 A485=0.6 A625 = 0.8 A625 = 0.2 In the NaOH solution, essentially all of the indicator is present as In; in the acidic solution, it is essentially all in the form of HIn. Please calculate the acid dissociation constant for the indicator if a pH 5.00 buffer containing a small amount of the indicator exhibits an absorbance of 0.5 at 485 nm and 0.4 at 625 nm (1.00-cm cells).
Transcribed Image Text:HIn H + I¯ color 1 color 2 The following absorbance data were obtained for a 5.00 × 104 M solution of HIn in 0.1 M NaOH and 0.1 M HCl. Measurements were made at a wavelength of 485 nm and 625 nm with 1.00-cm cells. 0.1 M NaOH: 0.1 M HCl: A485 0.05 A485=0.6 A625 = 0.8 A625 = 0.2 In the NaOH solution, essentially all of the indicator is present as In; in the acidic solution, it is essentially all in the form of HIn. Please calculate the acid dissociation constant for the indicator if a pH 5.00 buffer containing a small amount of the indicator exhibits an absorbance of 0.5 at 485 nm and 0.4 at 625 nm (1.00-cm cells).
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