Q4. The acid base indicator HIn undergoes the following reaction in dilute aqueous solution 10 H+ + In HIn When a 5x10-4 M solution of HIn put in 0.1 M NaOH and in 0.1 M HCl, the following data were obtained. Note that all the indicator will be existing as HIn in 0.1 M HCl and existing as In in NaOH, Solution 0.1 M NaOH 0.1 M HCI A at 485 nm 0.052 0.454 A at 625 nm 0.823 0.176 Calculate a) The molar absorptivity of HIn and In" at 485 and 625 nm b) The acid dissociation constant (Ka) if a small amount of the indicator at pH 5 gave A = 0.472 at 485 nm and A = 0.351 at 625 nm.

Introductory Chemistry: A Foundation
9th Edition
ISBN:9781337399425
Author:Steven S. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Donald J. DeCoste
Chapter16: Acids And Bases
Section: Chapter Questions
Problem 61QAP: . Which component of a buffered solution is capable of combining with an added strong acid? Using...
icon
Related questions
Question
Q4. The acid base indicator HIn undergoes the following reaction in dilute aqueous solution
10 H+ + In
HIn
When a 5x10-4 M solution of HIn put in 0.1 M NaOH and in 0.1 M HCl, the following data
were obtained. Note that all the indicator will be existing as HIn in 0.1 M HCl and existing as
In in NaOH,
Solution
0.1 M NaOH
0.1 M HCI
A at 485 nm
0.052
0.454
A at 625 nm
0.823
0.176
Calculate
a) The molar absorptivity of HIn and In" at 485 and 625 nm
b) The acid dissociation constant (Ka) if a small amount of the indicator at pH 5 gave A
= 0.472 at 485 nm and A = 0.351 at 625 nm.
Transcribed Image Text:Q4. The acid base indicator HIn undergoes the following reaction in dilute aqueous solution 10 H+ + In HIn When a 5x10-4 M solution of HIn put in 0.1 M NaOH and in 0.1 M HCl, the following data were obtained. Note that all the indicator will be existing as HIn in 0.1 M HCl and existing as In in NaOH, Solution 0.1 M NaOH 0.1 M HCI A at 485 nm 0.052 0.454 A at 625 nm 0.823 0.176 Calculate a) The molar absorptivity of HIn and In" at 485 and 625 nm b) The acid dissociation constant (Ka) if a small amount of the indicator at pH 5 gave A = 0.472 at 485 nm and A = 0.351 at 625 nm.
AI-Generated Solution
AI-generated content may present inaccurate or offensive content that does not represent bartleby’s views.
steps

Unlock instant AI solutions

Tap the button
to generate a solution

Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Introductory Chemistry: A Foundation
Introductory Chemistry: A Foundation
Chemistry
ISBN:
9781337399425
Author:
Steven S. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry: An Atoms First Approach
Chemistry: An Atoms First Approach
Chemistry
ISBN:
9781305079243
Author:
Steven S. Zumdahl, Susan A. Zumdahl
Publisher:
Cengage Learning
Chemistry
Chemistry
Chemistry
ISBN:
9781133611097
Author:
Steven S. Zumdahl
Publisher:
Cengage Learning
Chemistry by OpenStax (2015-05-04)
Chemistry by OpenStax (2015-05-04)
Chemistry
ISBN:
9781938168390
Author:
Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:
OpenStax
Appl Of Ms Excel In Analytical Chemistry
Appl Of Ms Excel In Analytical Chemistry
Chemistry
ISBN:
9781285686691
Author:
Crouch
Publisher:
Cengage