You are testing a newly discovered pH indicator which has a Ka of 3.2 x 10-6. You carefully prepare a solution of 0.0034 M indicator in solutions of 0.5 M HCI, 0.5 M NaOH, and in unknown solution A. Then you put an undetermined amount of indicator into unknown solution B. You measure the visible absorption spectra of each of the four solutions. The data is illustrated in the graph and given in the table.
You are testing a newly discovered pH indicator which has a Ka of 3.2 x 10-6. You carefully prepare a solution of 0.0034 M indicator in solutions of 0.5 M HCI, 0.5 M NaOH, and in unknown solution A. Then you put an undetermined amount of indicator into unknown solution B. You measure the visible absorption spectra of each of the four solutions. The data is illustrated in the graph and given in the table.
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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Transcribed Image Text:You are testing a newly discovered pH indicator which has a K₂ of 3.2 x 10-6. You carefully prepare a solution of 0.0034 M indicator in solutions of 0.5 M HCI, 0.5 M
NaOH, and in unknown solution A. Then you put an undetermined amount of indicator into unknown solution B. You measure the visible absorption spectra of each of
the four solutions. The data is illustrated in the graph and given in the table.
1.2
Absorbance
0.5 M HCI
1.0
0.5 M NaOH
0.8
0.6
0.4
0.2
450
650
500 550 600
Wavelength (nm)
What is the pH of solution A, which contains 0.0034 M indicator?
5.18
X
What is the pH of solution B, which contains an undetermined amount of indicator?
.-. Sol A
-Sol B
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